LIANG, ZHIHE; ZHANG, HUIZHU; XU, NA; YE, SHUYAN; FAN, YANPENG; GE, HONGMEI. Gracefulness of five permutation graphs of paths. Utilitas Mathematica , [S. l.], v. 72, 2007. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/500. Acesso em: 8 may. 2026.