Advances in Information Retrieval Theory Third International Confere

This book constitutes the refereed proceedings of the Third International Conference on the Theory of Information Retrieval, ICTIR 2011, held in Bertinoro, Italy, in September 2011. The 25 revised full papers and 13 short papers presented together with th

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Editorial Board David Hutchison Lancaster University, UK Takeo Kanade Carnegie Mellon University, Pittsburgh, PA, USA Josef Kittler University of Surrey, Guildford, UK Jon M. Kleinberg Cornell University, Ithaca, NY, USA Alfred Kobsa University of California, Irvine, CA, USA Friedemann Mattern ETH Zurich, Switzerland John C. Mitchell Stanford University, CA, USA Moni Naor Weizmann Institute of Science, Rehovot, Israel Oscar Nierstrasz University of Bern, Switzerland C. Pandu Rangan Indian Institute of Technology, Madras, India Bernhard Steffen TU Dortmund University, Germany Madhu Sudan Microsoft Research, Cambridge, MA, USA Demetri Terzopoulos University of California, Los Angeles, CA, USA Doug Tygar University of California, Berkeley, CA, USA Gerhard Weikum Max Planck Institute for Informatics, Saarbruecken, Germany

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Giambattista Amati Fabio Crestani (Eds.)

Advances in Information Retrieval Theory Third International Conference, ICTIR 2011 Bertinoro, Italy, September 12-14, 2011 Proceedings

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Volume Editors Giambattista Amati Fondazione Ugo Bordoni Viale del Policlinico 147, 00161 Rome, Italy E-mail: [email protected] Fabio Crestani University of Lugano, Faculty of Informatics 6900 Lugano, Switzerland E-mail: [email protected]

ISSN 0302-9743 e-ISSN 1611-3349 ISBN 978-3-642-23317-3 e-ISBN 978-3-642-23318-0 DOI 10.1007/978-3-642-23318-0 Springer Heidelberg Dordrecht London New York Library of Congress Control Number: 2011934976 CR Subject Classification (1998): H.3, H.2, I.2.3, I.2.6, F.2.2, H.4, H.5.2-4, I.7 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI

© Springer-Verlag Berlin Heidelberg 2011 This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer. Violations are liable to prosecution under the German Copyright Law. The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)

Preface

These proceedings contain the refereed papers and posters presented at the Third International Conference on the Theory of Information Retrieval (ICTIR 2011), held in Bertinoro, Italy, during September 12–14, 2011. This biennial international conference provides an opportunity for the presentation of the latest work describing