Malozemov, Vasilii N., and Grigoriy Sh. Tamasyan. “Examples of the Best Piecewise Linear Approximation With Free Nodes”. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy 5, no. 4 (August 19, 2020): 623–630. Accessed May 19, 2024. https://math-mech-astr-journal.spbu.ru/article/view/8486.