R.K. MISHRA; AVTAR CHAND. String Cosmological Models in Alternative Theory of Gravity. Journal of International Academy of Physical Sciences, [S. l.], v. 21, n. 4, p. 305–320, 2017. Disponível em: https://www.iaps.org.in/journal/index.php/journaliaps/article/view/504. Acesso em: 17 may. 2025.