SkorokhodovD. S. “On the Existence of a Generalized Asymmetric (α, β)-Spline Whose Average Values Have Equal Minima at Given Points”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 61, no. 2, Feb. 2009, pp. 261-7, https://umj.imath.kiev.ua/index.php/umj/article/view/3017.