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 May 6, 2025. https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14110.