AMSil, Redakcja. 2003. “Report of Meeting. The Third Katowice-Debrecen Winter Seminar on Functional Equations and Inequalities January 29 - February 1, 2003, Będlewo, Poland”. Annales Mathematicae Silesianae 17 (September), 67-84. https://journals.us.edu.pl/index.php/AMSIL/article/view/14102.