Demkiv, I. I. “On Properties of Bernstein-Typ Operator p0lynomials Approximating the Urison operator.”. Ukrains’kyi Matematychnyi Zhurnal 56, no. 9 (September 25, 2004): 1172-1181. Accessed May 5, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3833.