RAUTENBACH, DIETER; SCHÄFER, PHILIPP MATTHIAS. Null-homotopic graphs and triangle-completions of spanning trees. Utilitas Mathematica , [S. l.], v. 92, 2013. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/913. Acesso em: 8 may. 2026.