AMSil, Redakcja. 2020. “Report of Meeting. The Twentieth Debrecen-Katowice Winter Seminar on Functional Equations and Inequalities Hajdúszoboszló (Hungary), January 29-February 1, 2020”. Annales Mathematicae Silesianae 34 (2), 286-304. https://journals.us.edu.pl/index.php/AMSIL/article/view/13625.