AMSil, Redakcja. “Report of Meeting. The Third Katowice-Debrecen Winter Seminar on Functional Equations and Inequalities January 29 - February 1, 2003, Będlewo, Poland”. Annales Mathematicae Silesianae, vol. 17, Sept. 2003, pp. 67-84, https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14102.