ZHANG, GUIZHI; AN, YONGHONG. The intersection problem for s(2,4, v)s with a common parallel class. Utilitas Mathematica , [S. l.], v. 114, 2020. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/1505. Acesso em: 7 may. 2026.