YONGQI, SUN; XIAOHUI, LIN; YUANSHENG, YANG; LEI, SHI. Extremal graphs without four-cycles or five-cycles. Utilitas Mathematica , [S. l.], v. 80, 2009. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/603. Acesso em: 8 may. 2026.