MACEDOŃSKA, Olga; POTYKA, Aleksandra. On S-length of groups. Annales Mathematicae Silesianae, [S. l.], v. 22, p. 59–67, 2008. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14052. Acesso em: 7 may. 2025.