PogoruiA. О. “Fading Evolutions in Multidimensional Spaces”. Ukrains’kyi Matematychnyi Zhurnal 62, no. 11 (November 25, 2010): 1577–1582. Accessed May 3, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2982.