Ivanov, I., Yesbayev, A., Yessenbayeva, G., & Ramazanov, M. (2015). On the solution of boundary value problems by the spectral element method. Bulletin of the Karaganda University. Mathematics Series, 79(3), 50–54. Retrieved from https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/47