ARIF SIDDIQUI, Mohammed, and Nandita GUPTA. “Approximation by a Generalization of Szász-Mirakjan Type Operators”. Studia Universitatis Babeș-Bolyai Mathematica, vol. 65, no. 4, Nov. 2020, pp. 575–583, doi:10.24193/subbmath.2020.4.07.