Rakisheva, Z. B., N. Delpeche-Ellmann, and A. K. Sakhayeva. “Studying Upwelling Phases in the Kazakhstan Part of the Caspian Sea”. International Journal of Mathematics and Physics 11, no. 1 (June 20, 2020): 45–50. Accessed May 2, 2024. https://ijmph.kaznu.kz/index.php/kaznu/article/view/313.