А.Sh. Shaldanbayev, А.А. Shaldanbayevа, и B.А. Shaldanbay. «ON SQUARE ROOT OF STURM-LIUVILLE OPERATOR». Academic Scientific Journal of Computer Science, no. 3 (июнь 10, 2019): 97–113. просмотрено декабрь 15, 2025. http://89.250.84.46/physics-mathematics/article/view/1640.