Mastroianni, G., and M. R. Occorsio. “A New Operator of Bernstein Type”. Anal. Numér. Théor. Approx. 16, no. 1 (February 1, 1987): 55–63. Accessed May 19, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1987-vol16-no1-art9.