Abishev М.Е., Тоktarbay С., Таlkhat А.З., and Abylayeva Ә.Ж. 2020. “THE STABILITY OF QUASI-CIRCULAR ORBITS NEAR THE CENTRAL BODY”. Bulletin of Abai KazNPU. Series of Physical and Mathematical Sciences 70 (2). Almaty, Kazakhstan:155-59. https://doi.org/10.51889/2020-2.1728-7901.23.