AMSilR. “Report of Meeting. The First Katowice-Debrecen Winter Seminar on Functional Equations, February 7-10, 2001, Cieszyn, Poland”. Annales Mathematicae Silesianae, Vol. 15, Sept. 2001, pp. 87-02, https://journals.us.edu.pl/index.php/AMSIL/article/view/14118.