GUTMAN, I.; YEH, Y.-N.; CHEN, J.-C. ON THE SUM OF ALL DISTANCES IN GRAPHS. Tamkang Journal of Mathematics, [S. l.], v. 25, n. 1, p. 83–86, 1994. DOI: 10.5556/j.tkjm.25.1994.4428. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4428. Acesso em: 28 apr. 2024.