LI, WEI QI; LI, JIN BO; MIAO, LIAN YING; SONG, WEN YAO. On r-hued coloring of planar graphs with girth at least 5. Utilitas Mathematica , [S. l.], v. 109, 2018. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/1280. Acesso em: 7 may. 2026.