MISHRA, DEBDAS; PANIGRAHI, PRATIMA. Some graceful lobsters with both odd and even degree vertices on the central path. Utilitas Mathematica , [S. l.], v. 74, 2007. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/468. Acesso em: 9 jul. 2026.