ISFS ISFS 2015. The 2nd International Symposium on Fuzzy Sets. Golden Jubilee of Fuzzy Sets : Abstracts. Rzeszów, Poland, 3. - 4. 12. 2015. -- Rzeszów : University of Rzeszów, Faculty of Mathematics and Natural Sciences, 2015. -- 28 s. -- ISBN : 978-83-7996-190-0.