Mustapha Bourahla. Reasoning over Vague Concepts. In Leszek Rutkowski, Marcin Korytkowski, Rafal Scherer, Ryszard Tadeusiewicz, Lotfi A. Zadeh, Jacek M. Zurada, editors, Artificial Intelligence and Soft Computing - 14th International Conference, ICAISC 2015, Zakopane, Poland, June 14-28, 2015, Proceedings, Part II. Volume 9120 of Lecture Notes in Computer Science, pages 591-602, Springer, 2015. [doi]