AMSil, Redakcja. 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 (September):87-99. https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14070.