Skaskiv О. B., and M. R. Lutsishin. “Minimum of the Multiple Dirichlet Series ”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 9 (October 7, 1992): 1295–1297. Accessed February 17, 2026. https://umj.imath.kiev.ua/index.php/umj/article/view/8187.