Ivanova, Velina, and Rumen Uluchev. “Smoothest Interpolation With Boundary Conditions in $W^3_2[a,b]$”. Ann. Sofia Univ. Fac. Math. and Inf. 106 (December 12, 2019): 153–174. Accessed November 22, 2024. https://annual.uni-sofia.bg/index.php/fmi/article/view/32.