Publishers Springer Nature Switzerland AG

Cover for Thinking, Drawing, Modelling: GEOMETRIAS 2017, Coimbra, Portugal, June 16–18 - Springer Proceedings in Mathematics & Statistics (Paperback Book) [2020 edition] (2021)

Thinking, Drawing, Modelling: GE... (2021)

Cover for Community Quality-of-Life Indicators: Best Cases VIII - Community Quality-of-Life and Well-Being (Paperback Book) [2020 edition] (2021)

Community Quality-of-Life Indica... (2021)

Cover for Ruwantissa Abeyratne · Aviation in the Digital Age: Legal and Regulatory Aspects (Paperback Book) [2020 edition] (2021)

Aviation in the Digital Age: Leg... (2021)

Ruwantissa Abeyratne

Cover for Matej Blatnik · Groundwater Distribution in the Recharge Area of Ljubljanica Springs - Springer Theses (Paperback Book) [2020 edition] (2021)

Groundwater Distribution in the ... (2021)

Cover for Nicola Cufaro Petroni · Probability and Stochastic Processes for Physicists - UNITEXT for Physics (Paperback Book) [2020 edition] (2021)

Probability and Stochastic Proce... (2021)

Nicola Cufaro Petroni

Cover for Giuliano Gadioli La Guardia · Quantum Error Correction: Symmetric, Asymmetric, Synchronizable, and Convolutional Codes - Quantum Science and Technology (Paperback Book) [2020 edition] (2021)

Quantum Error Correction: Symmet... (2021)

Giuliano Gadioli La Guardia

Cover for Javier Galego Pascual? · Polaritonic Chemistry: Manipulating Molecular Structure Through Strong Light–Matter Coupling - Springer Theses (Paperback Book) [2020 edition] (2021)

Polaritonic Chemistry: Manipulat... (2021)

Javier Galego Pascual?

Cover for Hamid Reza Rezaie · A Review on Dental Materials - Advanced Structured Materials (Paperback Book) [2020 edition] (2021)

A Review on Dental Materials - A... (2021)

Hamid Reza Rezaie

Cover for Smart Villages: Bridging the Global Urban-Rural Divide (Hardcover Book) [2022 edition] (2021)

Smart Villages: Bridging the Glo... (2021)

Cover for John Astin · Measuring EU Inflation: The Foundations of the HICP (Hardcover Book) [2021 edition] (2021)

Measuring EU Inflation: The Foun... (2021)

Cover for Dengsheng Zhang · Fundamentals of Image Data Mining: Analysis, Features, Classification and Retrieval - Texts in Computer Science (Hardcover Book) [2nd ed. 2021 edition] (2021)

2nd ed. 2021 edition

Fundamentals of Image Data Minin... (2021)

Dengsheng Zhang

Cover for Breast & Gynecological Diseases: Role of Imaging in the Management (Hardcover Book) [2021 edition] (2021)

Breast & Gynecological Diseases:... (2021)

Cover for Christiana Markou-Thalia Prastitou-Merdi-Tatiana-E · EU Internet Law in the Digital Single Market (Hardcover Book) [2021 edition] (2021)

EU Internet Law in the Digital S... (2021)

Christiana Markou-Thalia Prastit...

Cover for Engaging with Work in English Studies: An Issue-based Approach (Hardcover Book) [2021 edition] (2021)

Engaging with Work in English St... (2021)

Cover for Smart Services Summit: Digital as an Enabler for Smart Service Business Development - Progress in IS (Hardcover Book) [2021 edition] (2021)

Smart Services Summit: Digital a... (2021)

Cover for Necropower in North America: The Legal Spatialization Of Disposability And Lucrative Death (Hardcover Book) [2021 edition] (2021)

Necropower in North America: The... (2021)

Cover for Controversies in Neuro-Ophthalmic Management: An Evidence and Case-Based Appraisal (Hardcover Book) [2021 edition] (2021)

Controversies in Neuro-Ophthalmi... (2021)

Cover for Digital Interaction and Machine Intelligence: Proceedings of MIDI’2020 – 8th Machine Intelligence and Digital Interaction Conference, December 9-10, 2020, Warsaw, Poland (online) - Advances in Intelligent Systems and Computing (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Digital Interaction and Machine ... (2021)

Cover for Pawel Oclon · Renewable Energy Utilization Using Underground Energy Systems - Lecture Notes in Energy (Hardcover Book) [2021 edition] (2021)

Renewable Energy Utilization Usi... (2021)

Cover for Tomas Balezentis · Structural Change, Productivity, and Climate Nexus in Agriculture: An Eastern European Perspective (Hardcover Book) [2021 edition] (2021)

Structural Change, Productivity,... (2021)

Tomas Balezentis

Cover for Marilynne N. Kirshbaum · The Joyful Freedom Approach to Cancer-Related Fatigue: Introducing an Energy-Creating Framework (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

The Joyful Freedom Approach to C... (2021)

Marilynne N. Kirshbaum

Cover for The Role of e-Business during the Time of Grand Challenges: 19th Workshop on e-Business, WeB 2020, Virtual Event, December 12, 2020, Revised Selected Papers - Lecture Notes in Business Information Processing (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

The Role of e-Business during th... (2021)

Cover for Michal Kisielewicz · Set-Valued Stochastic Integrals and Applications - Springer Optimization and Its Applications (Paperback Book) [2020 edition] (2021)

Set-Valued Stochastic Integrals ... (2021)

Michal Kisielewicz

Cover for The Politics of Horror (Paperback Book) [2020 edition] (2021)

The Politics of Horror (2021)

Cover for The Carceral Network in Ireland: History, Agency and Resistance - Palgrave Studies in Prisons and Penology (Paperback Book) [2020 edition] (2021)

The Carceral Network in Ireland:... (2021)

Cover for Tumor Microenvironment: State of the Science - Advances in Experimental Medicine and Biology (Paperback Book) [1st ed. 2020 edition] (2021)

1st ed. 2020 edition

Tumor Microenvironment: State of... (2021)

Cover for Gopalan Mullik · Explorations in Cinema through Classical Indian Theories: New Interpretations of Meaning, Aesthetics, and Art (Paperback Book) [2020 edition] (2021)

Explorations in Cinema through C... (2021)

Cover for David Steinberg · The Multidisciplinary Nature of Morality and Applied Ethics (Paperback Book) [2020 edition] (2021)

The Multidisciplinary Nature of ... (2021)

David Steinberg

Cover for Business and Social Media in the Middle East: Strategies, Best Practices and Perspectives (Paperback Book) [1st ed. 2020 edition] (2021)

1st ed. 2020 edition

Business and Social Media in the... (2021)

Cover for Capitalism, Global Change and Sustainable Development - Springer Proceedings in Business and Economics (Paperback Book) [2020 edition] (2021)

Capitalism, Global Change and Su... (2021)

Cover for Wireless-Powered Backscatter Communications for Internet of Things - Internet of Things (Paperback Book) [2021 edition] (2021)

Wireless-Powered Backscatter Com... (2021)

Cover for The Peroneal Tendons: A Clinical Guide to Evaluation and Management (Paperback Book) [2020 edition] (2021)

The Peroneal Tendons: A Clinical... (2021)

Cover for Yuri Vassilevski · Parallel Finite Volume Computation on General Meshes (Paperback Book) [2020 edition] (2021)

Parallel Finite Volume Computati... (2021)

Yuri Vassilevski

Cover for Perspectives on Consumer Behaviour: Theoretical Aspects and Practical Applications - Contributions to Management Science (Paperback Book) [2020 edition] (2021)

Perspectives on Consumer Behavio... (2021)

Cover for Recent Advances in Intelligent Systems and Smart Applications - Studies in Systems, Decision and Control (Paperback Book) [2021 edition] (2021)

Recent Advances in Intelligent S... (2021)

Cover for Marco Tognon · Theory and Applications for Control of Aerial Robots in Physical Interaction Through Tethers - Springer Tracts in Advanced Robotics (Paperback Book) [2021 edition] (2021)

Theory and Applications for Cont... (2021)

Cover for Sukanlaya Sawang · Entrepreneurship Education: A Lifelong Learning Approach - Contributions to Management Science (Paperback Book) [2020 edition] (2021)

Entrepreneurship Education: A Li... (2021)

Sukanlaya Sawang

Cover for Anthony C. Fisher · Lecture Notes on Resource and Environmental Economics - The Economics of Non-Market Goods and Resources (Paperback Book) [2020 edition] (2021)

Lecture Notes on Resource and En... (2021)

Anthony C. Fisher

Cover for Alkaliphiles in Biotechnology - Advances in Biochemical Engineering / Biotechnology (Paperback Book) [1st ed. 2020 edition] (2021)

1st ed. 2020 edition

Alkaliphiles in Biotechnology - ... (2021)

Cover for Ayodele Odusola · Africa's Agricultural Renaissance: From Paradox to Powerhouse (Hardcover Book) [2021 edition] (2021)

Africa's Agricultural Renaissanc... (2021)

Ayodele Odusola

Cover for Black Box Optimization, Machine Learning, and No-Free Lunch Theorems - Springer Optimization and Its Applications (Hardcover Book) [2021 edition] (2021)

Black Box Optimization, Machine ... (2021)

Cover for Chemically Deposited Nanocrystalline Metal Oxide Thin Films: Synthesis, Characterizations, and Applications (Hardcover Book) [2021 edition] (2021)

Chemically Deposited Nanocrystal... (2021)

Cover for Sustainable Development Goals for Society Vol. 2: Food security, energy, climate action and biodiversity - Sustainable Development Goals Series (Hardcover Book) [2021 edition] (2021)

Sustainable Development Goals fo... (2021)

Cover for Ottar Ness · Relational Processes in Counselling and Psychotherapy Supervision - Palgrave Texts in Counselling and Psychotherapy (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Relational Processes in Counsell... (2021)

Cover for Sanjay Patole · Principles and Practice of Systematic Reviews and Meta-Analysis (Hardcover Book) [2021 edition] (2021)

Principles and Practice of Syste... (2021)

Cover for Jeffrey N. Weiss · Orthopedic Stem Cell Surgery (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Orthopedic Stem Cell Surgery (2021)

Jeffrey N. Weiss

Cover for Challenges in Pediatric Kidney Transplantation: A Practical Guide (Hardcover Book) [2021 edition] (2021)

Challenges in Pediatric Kidney T... (2021)

Cover for Sergey I. Nikolenko · Synthetic Data for Deep Learning - Springer Optimization and Its Applications (Hardcover Book) [2021 edition] (2021)

Synthetic Data for Deep Learning... (2021)

Sergey I. Nikolenko

Cover for Fady A. Harfoush · From Big Data to Intelligent Data: An Applied Perspective - Management for Professionals (Hardcover Book) [2021 edition] (2021)

From Big Data to Intelligent Dat... (2021)

Fady A. Harfoush

Cover for Raz Godelnik · Rethinking Corporate Sustainability in the Era of Climate Crisis: A Strategic Design Approach (Hardcover Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Rethinking Corporate Sustainabil... (2021)

Cover for Geometric Structures of Statistical Physics, Information Geometry, and Learning: SPIGL'20, Les Houches, France, July 27–31 - Springer Proceedings in Mathematics & Statistics (Hardcover Book) [2021 edition] (2021)

Geometric Structures of Statisti... (2021)

Cover for Hava Charlotte Lan Yurttagul · Whistleblower Protection by the Council of Europe, the European Court of Human Rights and the European Union: An Emerging Consensus - European Union and its Neighbours in a Globalized World (Hardcover Book) [2021 edition] (2021)

Whistleblower Protection by the ... (2021)

Hava Charlotte Lan Yurttagul

Cover for Timothy Tambassi · The Philosophy of Geo-Ontologies: Applied Ontology of Geography - SpringerBriefs in Geography (Paperback Book) [2nd ed. 2021 edition] (2021)

2nd ed. 2021 edition

The Philosophy of Geo-Ontologies... (2021)

Timothy Tambassi

Cover for Artificial Intelligence Applications and Innovations. AIAI 2021 IFIP WG 12.5 International Workshops: 5G-PINE 2021, AI-BIO 2021, DAAI 2021, DARE 2021, EEAI 2021, and MHDW 2021, Hersonissos, Crete, Greece, June 25–27, 2021, Proceedings - IFIP Advances in I (Hardcover Book) [2021 edition] (2021)

Artificial Intelligence Applicat... (2021)

Cover for Julia L Wright · Advances in Simulation and Digital Human Modeling: Proceedings of the AHFE 2021 Virtual Conferences on Human Factors and Simulation, and Digital Human Modeling and Applied Optimization, July 25-29, 2021, USA - Lecture Notes in Networks and Systems (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances in Simulation and Digit... (2021)

Cover for Matteo Zallio · Advances in Human Factors in Robots, Unmanned Systems and Cybersecurity: Proceedings of the AHFE 2021 Virtual Conferences on Human Factors in Robots, Drones and Unmanned Systems, and Human Factors in Cybersecurity, July 25-29, 2021, USA - Lecture Notes in (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances in Human Factors in Rob... (2021)

Cover for Salman Nazir · Advances in Human Factors in Training, Education, and Learning Sciences: Proceedings of the AHFE 2021 Virtual Conference on Human Factors in Training, Education, and Learning Sciences, July 25-29, 2021, USA - Lecture Notes in Networks and Systems (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances in Human Factors in Tra... (2021)

Cover for Advances in Human Aspects of Transportation: Proceedings of the AHFE 2021 Virtual Conference on Human Aspects of Transportation, July 25-29, 2021, USA - Lecture Notes in Networks and Systems (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances in Human Aspects of Tra... (2021)

Cover for Multi-disciplinary Trends in Artificial Intelligence: 14th International Conference, MIWAI 2021, Virtual Event, July 2–3, 2021, Proceedings - Lecture Notes in Computer Science (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Multi-disciplinary Trends in Art... (2021)

Cover for Understanding Media and Society in the Age of Digitalisation (Paperback Book) [2020 edition] (2021)

Understanding Media and Society ... (2021)

Cover for Researching and Writing on Contemporary Art and Artists: Challenges, Practices, and Complexities (Paperback Book) [2020 edition] (2021)

Researching and Writing on Conte... (2021)

Cover for Historical Turning Points in Spanish Economic Growth and Development, 1808–2008 - Palgrave Studies in Economic History (Paperback Book) [2020 edition] (2021)

Historical Turning Points in Spa... (2021)

Cover for Clevio Nobrega · A Handbook of Gene and Cell Therapy (Paperback Book) [2020 edition] (2021)

A Handbook of Gene and Cell Therapy (2021)

Cover for Technology in Practical Dermatology: Non-Invasive Imaging, Lasers and Ulcer Management (Paperback Book) [2020 edition] (2021)

Technology in Practical Dermatol... (2021)

Cover for Anatoly Belous · Viruses, Hardware and Software Trojans: Attacks and Countermeasures (Paperback Book) [2020 edition] (2021)

Viruses, Hardware and Software T... (2021)

Cover for Eurasian Business Perspectives: Proceedings of the 28th Eurasia Business and Economics Society Conference - Eurasian Studies in Business and Economics (Paperback Book) [1st ed. 2020 edition] (2021)

1st ed. 2020 edition

Eurasian Business Perspectives: ... (2021)

Cover for Eurasian Economic Perspectives: Proceedings of the 28th Eurasia Business and Economics Society Conference - Eurasian Studies in Business and Economics (Paperback Book) [2020 edition] (2021)

Eurasian Economic Perspectives: ... (2021)

Cover for Advances in Natural Computation, Fuzzy Systems and Knowledge Discovery - Lecture Notes on Data Engineering and Communications Technologies (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances in Natural Computation,... (2021)

Cover for Silvia Haindl · Iron-Based Superconducting Thin Films - Springer Series in Materials Science (Hardcover Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Iron-Based Superconducting Thin ... (2021)

Cover for Data Analysis and Classification: Methods and Applications - Studies in Classification, Data Analysis, and Knowledge Organization (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Data Analysis and Classification... (2021)

Cover for Design, Learning, and Innovation: 5th EAI International Conference, DLI 2020, Virtual Event, December 10-11, 2020, Proceedings - Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Design, Learning, and Innovation... (2021)

Cover for Naeem Tabassum · Corporate Governance and Organisational Performance: The Impact of Board Structure (Paperback Book) [2020 edition] (2021)

Corporate Governance and Organis... (2021)

Cover for Tawfik Jelassi · Strategies for e-Business: Concepts and Cases on Value Creation and Digital Business Transformation - Classroom Companion: Business (Paperback Book) [Fourth Edition 2020 edition] (2021)

Fourth Edition 2020 edition

Strategies for e-Business: Conce... (2021)

Cover for John Voight · Quaternion Algebras - Graduate Texts in Mathematics (Hardcover Book) [2021 edition] (2021)

Quaternion Algebras - Graduate T... (2021)

Cover for Tilda · TILDA: Towards Industrial LES / DNS in Aeronautics: Paving the Way for Future Accurate CFD - Results of the H2020 Research Project TILDA, Funded by the European Union, 2015 -2018 - Notes on Numerical Fluid Mechanics and Multidisciplinary Design (Hardcover Book) [2021 edition] (2021)

TILDA: Towards Industrial LES / ... (2021)

Cover for Clinical Atlas of CT Virtual Hysterosalpingography (Hardcover Book) [2021 edition] (2021)

Clinical Atlas of CT Virtual Hys... (2021)

Cover for Abe Davies · Imagining the Soul in Premodern Literature - Early Modern Literature in History (Hardcover Book) [2021 edition] (2021)

Imagining the Soul in Premodern ... (2021)

Cover for Presidents, Unified Government and Legislative Control - Palgrave Studies in Presidential Politics (Hardcover Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Presidents, Unified Government a... (2021)

Cover for Alexander V Glushkov · Advances in Methods and Applications of Quantum Systems in Chemistry, Physics, and Biology - Progress in Theoretical Chemistry and Physics (Hardcover Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances in Methods and Applicat... (2021)

Alexander V Glushkov

Cover for Archaeologies of Animal Movement. Animals on the Move - Themes in Contemporary Archaeology (Hardcover Book) [2021 edition] (2021)

Archaeologies of Animal Movement... (2021)

Cover for James Leggott · The North East of England on Film and Television (Hardcover Book) [2021 edition] (2021)

The North East of England on Fil... (2021)

Cover for Pieter M. Kroonenberg · Multivariate Humanities - Quantitative Methods in the Humanities and Social Sciences (Hardcover Book) [2021 edition] (2021)

Multivariate Humanities - Quanti... (2021)

Pieter M. Kroonenberg

Cover for Sunil Nautiyal · Field Margin Vegetation and Socio-Ecological Environment: Structural, Functional and Spatio-temporal Dynamics in Rural-urban Interface of Bengaluru - Environmental Science and Engineering (Hardcover Book) [2021 edition] (2021)

Field Margin Vegetation and Soci... (2021)

Cover for Ocean Literacy: Understanding the Ocean - Key Challenges in Geography (Hardcover Book) [2021 edition] (2021)

Ocean Literacy: Understanding th... (2021)

Cover for Business in Africa in the Era of Digital Technology: Essays in Honour of Professor William Darley - Advances in Theory and Practice of Emerging Markets (Hardcover Book) [2021 edition] (2021)

Business in Africa in the Era of... (2021)

Cover for Michael K. Wohlgenant · Market Interrelationships and Applied Demand Analysis: Bridging the Gap Between Theory and Empirics in Commodities Markets - Palgrave Studies in Agricultural Economics and Food Policy (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Market Interrelationships and Ap... (2021)

Michael K. Wohlgenant

Cover for Soil Microbiomes for Sustainable Agriculture: Functional Annotation - Sustainable Development and Biodiversity (Hardcover Book) [2021 edition] (2021)

Soil Microbiomes for Sustainable... (2021)

Cover for Kevin Tavin · Post-Digital, Post-Internet Art and Education: The Future is All-Over - Palgrave Studies in Educational Futures (Hardcover Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Post-Digital, Post-Internet Art ... (2021)

Cover for Post-Digital, Post-Internet Art and Education: The Future is All-Over - Palgrave Studies in Educational Futures (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Post-Digital, Post-Internet Art ... (2021)

Cover for Valeria Piro · Migrant Farmworkers in 'Plastic Factories’: Investigating Work-Life Struggles (Hardcover Book) [2021 edition] (2021)

Migrant Farmworkers in 'Plastic ... (2021)

Cover for Yaochu Jin · Data-Driven Evolutionary Optimization: Integrating Evolutionary Computation, Machine Learning and Data Science - Studies in Computational Intelligence (Hardcover Book) [2021 edition] (2021)

Data-Driven Evolutionary Optimiz... (2021)

Cover for Structural Characterization and Seismic Retrofitting of Adobe Constructions: Experimental and Numerical Developments - Building Pathology and Rehabilitation (Hardcover Book) [2021 edition] (2021)

Structural Characterization and ... (2021)

Cover for Thomas Sealy · Religiosity and Recognition: Multiculturalism and British Converts to Islam - Palgrave Politics of Identity and Citizenship Series (Hardcover Book) [2021 edition] (2021)

Religiosity and Recognition: Mul... (2021)

Cover for Aldon Lynn Nielsen · The Inside Songs of Amiri Baraka - Palgrave Studies in Music and Literature (Hardcover Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

The Inside Songs of Amiri Baraka... (2021)

Aldon Lynn Nielsen

Cover for Developments in Information & Knowledge Management for Business Applications: Volume 2 - Studies in Systems, Decision and Control (Hardcover Book) [2021 edition] (2021)

Developments in Information & Kn... (2021)

Cover for Osman Latiff · Navigating War, Dissent and Empathy in Arab / U.S Relations: Seeing Our Others in Darkened Spaces (Hardcover Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Navigating War, Dissent and Empa... (2021)

Cover for Michel Claessens · The Science And Politics Of Covid-19 (Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

The Science And Politics Of Covi... (2021)

Michel Claessens

Cover for Xingming Sun · Advances in Artificial Intelligence and Security: 7th International Conference, ICAIS 2021, Dublin, Ireland, July 19-23, 2021, Proceedings, Part I - Communications in Computer and Information Science (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances in Artificial Intellige... (2021)

Cover for Xingming Sun · Advances in Artificial Intelligence and Security: 7th International Conference, ICAIS 2021, Dublin, Ireland, July 19-23, 2021, Proceedings, Part II - Communications in Computer and Information Science (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances in Artificial Intellige... (2021)

Cover for Xingming Sun · Advances in Artificial Intelligence and Security: 7th International Conference, ICAIS 2021, Dublin, Ireland, July 19-23, 2021, Proceedings, Part III - Communications in Computer and Information Science (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances in Artificial Intellige... (2021)