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://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/16499. Acesso em: 6 may. 2025.