Mikityuk I. V., and Prikarpatsky A. K. “Reduction and Geometric Samplings ”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 9 (October 7, 1992): 1220-1228. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8172.