PROTASOV, I.V.; PROTASOVA, K.D. Around $P$-small subsets of groups. Carpathian Mathematical Publications, [S. l.], v. 6, n. 2, p. 337–341, 2014. DOI: 10.15330/cmp.6.2.337-341. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/1365. Acesso em: 5 may. 2024.