FURS, Alexander N. Integrals of finite motion in the Schwarzschild gravitational field up to terms of order c^–2. Journal of the Belarusian State University. Physics, [S. l.], n. 3, p. 31–43, 2023. Disponível em: https://journals.bsu.by/index.php/physics/article/view/5834. Acesso em: 17 jul. 2026.