Stancu, Dimitrie D., and Ioana Taşcu. “On Some Bivariate Interpolation Procedures”. Rev. Anal. Numér. Théor. Approx. 33, no. 1 (February 1, 2004): 97–106. Accessed April 26, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2004-vol33-no1-art13.