AMSil, Redakcja. “Report of Meeting: The Ninth Katowice–Debrecen Winter Seminar on Functional Equations and Inequalities, Będlewo (Poland), February 4–7, 2009”. Annales Mathematicae Silesianae 23 (September 30, 2009): 103-117. Accessed May 17, 2024. https://journals.us.edu.pl/index.php/AMSIL/article/view/14047.