AMSil, Redakcja. “Problem Session. The 4th Czech and Polish Conference on Number Theory Cieszyn, June 11-14, 2002”. Annales Mathematicae Silesianae 16 (January 30, 2003): 79–81. Accessed December 5, 2025. https://journals.us.edu.pl/index.php/AMSIL/article/view/14110.