AMSilR. (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://journals.us.edu.pl/index.php/AMSIL/article/view/14070