А.Г. Есенгалиев, and А.Б. Муканов. “High-Precision Satellite Orbit Propagation With Estimation of the Covariance Matrix”. Bulletin of L.N. Gumilyov Eurasian National University. Mathematics, Computer Science, Mechanics Series, vol. 141, no. 4, Dec. 2022, pp. 6-27, doi:10.32523/2616-7182/bulmathenu.2022/4.1.