Martínez, Rodrigo, and Cristino Guzmán. “Invariancia Del Tensor Curvatura En Estructuras H-Equivalentes”. Pro Mathematica 18, no. 35-36 (September 5, 2004): 37-46. Accessed October 20, 2024. https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10217.