Cătinaş, Teodora. “Bounds for the Remainder in the Bivariate Shepard Interpolation of Lidstone Type”. Rev. Anal. Numér. Théor. Approx. 34, no. 1 (February 1, 2005): 47–53. Accessed May 5, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2005-vol34-no1-art5.