ALSHRAFI, O. A. A.; QUSAILAH, M. S.; AL-MOTAWAKE, M. K.; ALKELLY, A. A. On the Connection Between Lovelock Gravity and the Poincaré-Hopf Index. Sana’a University Journal of Applied Sciences and Technology , [S. l.], v. 3, n. 6, p. 1315–1322, 2025. DOI: 10.59628/jast.v3i6.2041. Disponível em: https://journals.su.edu.ye/index.php/jast/article/view/2041. Acesso em: 19 jan. 2026.