Bărbosu, Dan. “Approximation Properties of a Bivariate Stancu Type Operator”.
Rev. Anal. Numér. Théor. Approx.
34, no. 1 (February 1, 2005): 17–21. Accessed April 11, 2025.
https://ictp.acad.ro/jnaat/journal/article/view/2005-vol34-no1-art2
.