Advances in Information Retrieval 35th European Conference on IR Research, ECIR 2013, Moscow, Russia, March 24-27, 2013. Proceedings - Serdyukov, Pavel; Braslavski, Pavel; Kuznetsov, Sergei O.; Kamps, Jaap; Rüger, Stefan; Agichtein, Eugene; Segalovich, Ilya; Yilmaz, Emine (Springer Berlin Heidelberg : Imprint: Springer, 2013)