AMSil R. Report of Meeting. The Thirteenth Katowice–Debrecen Winter Seminar on Functional Equations and Inequalities, Zakopane (Poland), January 30 – February 2, 2013. Ann. Math. Sil. [Internet]. 2013 Sep. 30 [cited 2025 May 8];27:107-25. Available from: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14008