1. M. Ali, R.B. Paris2, Generalization of Szasz operator involving multiple Sheff er polynomials, arXiv:2006.11131v1, Math CA, (2020) 2–14.
2. S.N. Bernstein, Démonstration duthéorèmede Weierstrass fondéesurla calculdes probabilities, Commun. Soc. Math. Charkow Sér. 2t.13, (1912), 1–2.
3. A. Ciupa, On a generalized Favard-Szasz type operator, Research Seminar on Numerical and Statistical Calculus, Univ. Babes-Bolyai Cluj-Napoca, preprint 1 (1994) 33–38.
4. A. Ciupa, On the approximation by Favard-Szasz type operators, Rev. Anal. Number. Theor. Approx., 25 (1996), 57–61.
5. A. Ciupa, On the approximation by Kantorovich variant of a Favard-Szasz type operator, Studia Univ. Babes-Bolyai Math. 42 (1997) 41–45.