Makarov, V. Yu. “Characteristics of Power Growth of a Multidimensional Series of Exponents”. Ukrains’kyi Matematychnyi Zhurnal 46, no. 4 (April 25, 1994): 438–442. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5743.