GURTU, S. K. Time Variation of Orbital Parameters of an Equatorial Satellite. Defence Science Journal, [S. l.], v. 31, n. 4, p. 277–284, 2014. DOI: 10.14429/dsj.31.6372. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/6372. Acesso em: 16 jun. 2025.