Leetma, Evely, and Gennadi Vainikko. “Quasi‐interpolation by Splines on the Uniform Knot Sets”. Mathematical Modelling and Analysis 12, no. 1 (March 31, 2007): 107-120. Accessed January 6, 2025. https://mla.vgtu.lt/index.php/MMA/article/view/7099.