BOSHKAYEV, K.; MUCCINO, M.; RUEDA, J.; ZHUMAKHANOVA, G. Fundamental frequencies in the Schwarzschild Spacetime. Physical Sciences and Technology, [S. l.], v. 3, n. 2, p. 25–31, 2018. DOI: 10.26577/phst-2016-2-103. Disponível em: https://phst.kaznu.kz/index.php/journal/article/view/103. Acesso em: 4 jan. 2025.