Bărbosu, D., O. T. Pop, and D. Miclăuş. “The Kantorovich Form of Some Extensions for the Szász-Mirakjan Operators”. Rev. Anal. Numér. Théor. Approx., vol. 39, no. 1, Feb. 2010, pp. 8-20, doi:10.33993/jnaat391-916.