Information retrieval 9th Russian Summer School, RuSSIR 2015, Saint Petersburg, Russia, August 24-28, 2015 : revised selected papers - Braslavski, Pavel; Markov, Ilya; Pardalos, Panos M. 1954-; Volkovich, Yana; Ignatov, Dmitrij I.; Koltsov, Sergei; Koltsova, Olessia (Springer, 2016)