BOYKO, O. P.; MARTYNYUK, O. M.; PIVOVARCHIK, V. M. Upper bound for the diameter of a tree in the quantum graph theory. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 74, n. 8, p. 1020–1028, 2022. DOI: 10.37863/umzh.v74i8.7176. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7176. Acesso em: 5 dec. 2025.