AMSil, Redakcja. “Report of Meeting. The Sixth Debrecen-Katowice Winter Seminar On Functional Equations and Inequalities February 1-4, 2006, Berekfürdő, Hungary”. Annales Mathematicae Silesianae, vol. 20, Sept. 2006, pp. 87-99, https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14070.