Della Vecchia, B., and D. H. Mache. “On Approximation Properties of Stancu-Kantorovich Operators”. Rev. Anal. Numér. Théor. Approx. 27, no. 1 (February 1, 1998): 71–80. Accessed May 2, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1998-vol27-no1-art8.