NURDIN; BASKORO E.T.; SALMAN A.N.M.; GAOS N.N. On total vertex-irregular labellings for several types of trees. Utilitas Mathematica , [S. l.], v. 117, 2020. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/1457. Acesso em: 7 may. 2026.