AMSIL, Redakcja. The 2nd Czech and Polish Conference on Number Theory Cieszyn 1998. Problem session. Annales Mathematicae Silesianae, [S. l.], v. 12, p. 173–174, 1998. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14178. Acesso em: 12 apr. 2025.