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This two-volume set LNCS 12035 and 12036 constitutes the refereed proceedings of the 42nd European Conference on IR Research, ECIR 2020, held in Lisbon, Portugal, in April 2020.* The 55 full papers presented together with 8 reproducibility papers, 46 short papers, 10 demonstration papers, 12 invited CLEF papers, 7 doctoral consortium papers, 4 workshop papers, and 3 tutorials were carefully reviewed and selected from 457 submissions. They were organized in topical sections named: Part I: deep learning I; entities; evaluation; recommendation; information extraction; deep learning II; retrieval; multimedia; deep learning III; queries; IR – general; question answering, prediction, and bias; and deep learning IV. Part II: reproducibility papers; short papers; demonstration papers; CLEF organizers lab track; doctoral consortium papers; workshops; and tutorials. *Due to the COVID-19 pandemic, this conference was held virtually.

Data mining. --- Algorithmic knowledge discovery --- Factual data analysis --- KDD (Information retrieval) --- Knowledge discovery in data --- Knowledge discovery in databases --- Mining, Data --- Database searching --- Information storage and retrieval. --- Application software. --- Database management. --- Artificial intelligence. --- Information Storage and Retrieval. --- Information Systems Applications (incl. Internet). --- Database Management. --- Artificial Intelligence. --- Computer Appl. in Social and Behavioral Sciences. --- Data Mining and Knowledge Discovery. --- AI (Artificial intelligence) --- Artificial thinking --- Electronic brains --- Intellectronics --- Intelligence, Artificial --- Intelligent machines --- Machine intelligence --- Thinking, Artificial --- Bionics --- Cognitive science --- Digital computer simulation --- Electronic data processing --- Logic machines --- Machine theory --- Self-organizing systems --- Simulation methods --- Fifth generation computers --- Neural computers --- Data base management --- Data services (Database management) --- Database management services --- DBMS (Computer science) --- Generalized data management systems --- Services, Database management --- Systems, Database management --- Systems, Generalized database management --- Application computer programs --- Application computer software --- Applications software --- Apps (Computer software) --- Computer software

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This book constitutes the proceedings of the 35th European Conference on IR Research, ECIR 2013, held in Moscow, Russia, in March 2013. The 55 full papers, 38 poster papers and 10 demonstrations presented in this volume were carefully reviewed and selected from 287 submissions. The papers are organized in the following topical sections: user aspects; multimedia and cross-media IR; data mining; IR theory and formal models; IR system architectures; classification; Web; event detection; temporal IR, and microblog search. Also included are 4 tutorial and 2 workshop presentations.

Computer science. --- Database management. --- Data mining. --- Information storage and retrieval systems. --- Multimedia systems. --- Computer Science. --- Information Storage and Retrieval. --- Database Management. --- Data Mining and Knowledge Discovery. --- Multimedia Information Systems. --- Information Systems Applications (incl. Internet). --- User Interfaces and Human Computer Interaction. --- Information retrieval --- Data mining --- Information storage and retrieval systems --- Engineering & Applied Sciences --- Computer Science --- Computer-based multimedia information systems --- Multimedia computing --- Multimedia information systems --- Multimedia knowledge systems --- Automatic data storage --- Automatic information retrieval --- Automation in documentation --- Computer-based information systems --- Data processing systems --- Data storage and retrieval systems --- Discovery systems, Information --- Information discovery systems --- Information processing systems --- Information retrieval systems --- Machine data storage and retrieval --- Mechanized information storage and retrieval systems --- Algorithmic knowledge discovery --- Factual data analysis --- KDD (Information retrieval) --- Knowledge discovery in data --- Knowledge discovery in databases --- Mining, Data --- Data base management --- Data services (Database management) --- Database management services --- DBMS (Computer science) --- Generalized data management systems --- Services, Database management --- Systems, Database management --- Systems, Generalized database management --- Informatics --- Information storage and retrieval. --- Multimedia information systems. --- User interfaces (Computer systems). --- Data Mining. --- Datenbanksystem. --- Dokumentverarbeitung. --- Information Retrieval. --- World Wide Web 2.0. --- World Wide Web. --- Dokumentenverarbeitung --- Dokument --- Verarbeitung --- Datenbankverwaltungssystem --- DBMS --- Datenbankbetriebssystem --- Datenbank --- Datenbankmanagementsystem --- Data base management system --- Data base system --- Datenbanksoftware --- Datenbankprogramm --- Datamining --- Datenmustererkennung --- Data-Mining --- Suchverfahren --- Wissensextraktion --- WWW --- Hypermedia --- Internet --- Web 2.0 --- WWW 2.0 --- Semantic Web --- Soziale Software --- Informationsretrieval --- Information --- Informationsrecherche --- Informationswiedergewinnung --- Retrieval --- Informationsrückgewinnung --- Informationsgewinnung --- Literaturrecherche --- Online-Recherche --- Recherche --- Information Extraction --- Betriebssystem --- Programm --- Wiedergewinnung --- Information storage and retrieva. --- Science --- Database searching --- Electronic data processing --- Computer systems --- Electronic information resources --- Data libraries --- Digital libraries --- Information organization --- Application software. --- Interfaces, User (Computer systems) --- Human-machine systems --- Human-computer interaction --- Application computer programs --- Application computer software --- Applications software --- Apps (Computer software) --- Computer software