Miheşan, Vasile. “On the Modified Beta Approximating Operators of First Kind”. Rev. Anal. Numér. Théor. Approx. 33, no. 1 (February 1, 2004): 67–71. Accessed April 11, 2025. https://ictp.acad.ro/jnaat/journal/article/view/2004-vol33-no1-art8.