CHERKASHIN, D. On small non-uniform hypergraphs without property B. Mathematics and Education in Mathematics, [S. l.], v. 52, p. 71–75, 2023. DOI: 10.55630/mem.2023.52.71-75. Disponível em: https://smb.math.bas.bg/mem/index.php/memjournal/article/view/74. Acesso em: 6 oct. 2026.