MakarovV. L., KhlobystovV. V., and KashpurO. F. “Operator Interpolation and Systems of Linear Equations and Inequalities in Euclidean Spaces”. Ukrains’kyi Matematychnyi Zhurnal 72, no. 11 (November 20, 2020): 1524-1534. Accessed November 29, 2020. http://umj.imath.kiev.ua/index.php/umj/article/view/6201.