Polarity Lexicon for the Polish Language: Design and Extension with Random Walk Algorithm - Haniewicz, Konstanty; Kaczmarek, Monika; Adamczyk, Magdalena; Rutkowski, Wojciech (Advances in Systems Science - Proceedings of the International Conference on Systems Science 2013, ICSS 2013, Wroclaw, Poland, September 10-12, 2013, 2013)