Oşan, Cristina O., and Radu T. Trîmbitaş. “Combined Shepard Operators With Chebyshev Nodes”. Rev. Anal. Numér. Théor. Approx. 33, no. 1 (February 1, 2004): 73–78. Accessed September 3, 2025. https://www.ictp.acad.ro/jnaat/journal/article/view/2004-vol33-no1-art9.