Stancu, Dimitrie D. “Use of Identity of A. Hurwitz for Construction of a Linear Positive Operator of Approximation”. Rev. Anal. Numér. Théor. Approx. 31, no. 1 (February 1, 2002): 115–118. Accessed July 20, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2002-vol31-no1-art13.