SHARSHEKEEV, O.; SAGYNBAEV, M.; TAUKENOVA, A. CLOSED FRIEDMANN MODEL IN A MODIFIED GRAVITATIONAL THEORY. Recent Contributions to Physics, [S. l.], v. 2011, n. 4, p. 70–75, 2011. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/667. Acesso em: 9 feb. 2026.