1. Acu, A.M., Gonska, H.: Perturbed Bernstein-type operators arXiv:1809.07511v2 [math.NA]
2. Çetin, N.: Approximation and geometric properties of complex $$\alpha -$$Bernstein operator. Results Math. 74, 40 (2019). https://doi.org/10.1007/s00025-018-0953-z
3. Çetin, N., Başcanbaz-Tunca, G.: Approximation by a new complex generalized Bernstein operators. An. Univ. Oradea Fasc. Mat. 26(2), 127–139 (2019)
4. Dzyadyk, V.K., Shevchuk, I.A.: Theory of uniform approximation of functions by polynomials. Walter de Gruyter GmbH & Co. KG, Berlin (2008)
5. Gal, S.G.: Approximation by Complex Bernstein and Convolution Type Operators, Series on Concrete and Applicable Mathematics, vol. 8. World Scientific Publishing Co. Pte. Ltd., Hackensack, NJ (2009)