Skaskiv, O.B. and Trusevich О.M. (2001) “Relations of Borel Type for Generalizations of Exponential Series”, Ukrains’kyi Matematychnyi Zhurnal, 53(11), pp. 1580–1584. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4379 (Accessed: 6 December 2025).