BAZAR, K. .; FAKHRIDDIN, F. . Application of Index Theory in the Study of Special Points of Differential Equations. European Journal of Life Safety and Stability (2660-9630), [S. l.], p. 199-203, 2022. Disponível em: http://www.ejlss.indexedresearch.org/index.php/ejlss/article/view/395. Acesso em: 5 oct. 2025.