Avagyan, G.S., and L.R. Rafaelyan. “APPROXIMATION BY POISED SETS OF NODES”. Proceedings of the YSU A: Physical and Mathematical Sciences 46, no. 1 (227) (March 6, 2012): 60–62. Accessed September 20, 2024. https://pub.ysu.am/index.php/proceedings-phys-math/article/view/vol46_no1_2012_pp060-062.