Media type: E-Article Title: Lecture Notes in Computer Science: Studying Query Expansion Effectiveness Contributor: He, Ben; Ounis, Iadh Published: Springer Berlin Heidelberg, 2009 Published in: Lecture Notes in Computer Science (2009), Seite 611-619 Language: Not determined DOI: 10.1007/978-3-642-00958-7_57 ISBN: 9783642009570; 9783642009587 ISSN: 0302-9743; 1611-3349 Origination: Footnote: