Analysis of Images, Social Networks and Texts 4th International Conference, AIST 2015, Yekaterinburg, Russia, April 9–11, 2015, Revised Selected Papers - Khachay, Mikhail Yu; Konstantinova, Natalia; Panchenko, Alexander; Ignatov, Dmitry I.; Labunets, Valeri G. (Springer International Publishing : Imprint: Springer, 2015)