JAKIMCZUK, Rafael. Some general theorems about a class of sets of numbers. Annales Mathematicae Silesianae, [S. l.], v. 38, n. 2, p. 314–335, 2023. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/16499. Acesso em: 22 dec. 2025.