Kuznetsova О. M. “Continuation of Positively Determined Functions on the Ball in the Infinite Sphere ”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 4 (April 17, 1992): 489-497. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/7890.