Scheffold, Egon. “Zur Interpolation Gestreuter Daten: On Interpolation of Scattered Data”. Rev. Anal. Numér. Théor. Approx. 29, no. 2 (August 1, 2000): 201–206. Accessed April 26, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2000-vol29-no2-art10.