KHOSROVSHAHI G.B.; YOUSEFI-AZARI H. Octahedrals in Steiner quadruple systems. Utilitas Mathematica , [S. l.], v. 51, 1997. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/58. Acesso em: 8 may. 2026.