1. Abel, U., Ivan, M.: Asymptotic expansion of the Jakimovski–Leviatan operators and their derivatives, functions, series, operators. Budapest 103–119 (1999)
2. Acu, A.M.: Approximation by certain positive linear operators, Habilitation thesis, Tehnical University of Cluj-Napoca (2016)
3. Büyükyazici, I., Tanberkan, H., Serenbay, S.K., Atakut, C.: Approximation by Chlodowsky type Jakimovski–Leviatan operators. J. Comput. Appl. Math. 259, 153–163 (2014)
4. Ciupa, A.: Modified Jakimovski–Leviatan operators. Creat. Math. Inf. 16, 13–19 (2007)
5. Sidharth, M., Acu, A.M., Agrawal, P.N.: Chlodowsky–Szasz–Appell-type operators for functions of two variables. Ann. Funct. Anal. 8(4), 446–459 (2017)