AMSil, Redakcja. 2005. “Report of Meeting. The Fifth Katowice-Debrecen Winter Seminar On Functional Equations and Inequalities February 2-5, 2005, Będlewo, Poland”. Annales Mathematicae Silesianae 19 (September), 65-78. https://journals.us.edu.pl/index.php/AMSIL/article/view/14087.