1.
Berngardt O, Voronov A. A least squares method for sums of functions satisfying the differential equations with polynomial coefficients. Num. Meth. Prog. [Internet]. 2003 Apr. 11 [cited 2024 Apr. 26];4(4):167-71. Available from: https://en.num-meth.ru/index.php/journal/article/view/85