Skaskiv О.B. and Lutsishin , M.R. (1992) “Minimum of the multiple Dirichlet series ”, Ukrains’kyi Matematychnyi Zhurnal, 44(9), pp. 1295–1297. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8187 (Accessed: 5 December 2025).