Skaskiv, O. B., and TrusevichО. M. “Relations of Borel Type for Generalizations of Exponential Series”. Ukrains’kyi Matematychnyi Zhurnal 53, no. 11 (November 25, 2001): 1580-1584. Accessed May 18, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4379.