AMSil, R. (2006). Report of Meeting. The Sixth Debrecen-Katowice Winter Seminar On Functional Equations and Inequalities February 1-4, 2006, Berekfürdő, Hungary. Annales Mathematicae Silesianae, 20, 87–99. Retrieved from https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14070