Boyko, O.P., Martynyuk, O.M. and Pivovarchik, V.M. 2022. Upper bound for the diameter of a tree in the quantum graph theory. Ukrains’kyi Matematychnyi Zhurnal. 74, 8 (Oct. 2022), 1020 - 1028. DOI:https://doi.org/10.37863/umzh.v74i8.7176.