AMSil, Redakcja. “Report of Meeting. The Fourth Debrecen-Katowice Winter Seminar on Functional Equations and Inequalities February 4-7, 2004 Matráháza, Hangary”. Annales Mathematicae Silesianae 18 (September 30, 2004): 65–75. Accessed May 6, 2025. https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14092.