Joaquín, Daniel A. “A Relationship Between the Curvature Tensor and the Difference Tensor for Affine Hypersurfaces”. Journal of Advance Research in Mathematics and Statistics (ISSN 2208-2409) 7, no. 1 (January 31, 2020): 01–05. Accessed December 22, 2024. https://nnpub.org/index.php/MS/article/view/789.