Language Processing and Intelligent Information Systems 20th International Conference, IIS 2013, Warsaw, Poland, June 17-18, 2013. Proceedings - Kłopotek, Mieczysław A.; Koronacki, Jacek; Marciniak, Małgorzata; Mykowiecka, Agnieszka; Wierzchoń, Sławomir T. (Springer Berlin Heidelberg : Imprint: Springer, 2013)