Plukas, Kostas. “Computation of the Interpolation of Two-Dimensial Splines of 3-Th and 5-Th Orders ”. Lietuvos matematikos rinkinys 37, no. I (December 15, 1997): 309–312 . Accessed April 19, 2025. https://journals.vu.lt./LMR/article/view/38247.