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), vol. 7, no. 1, Jan. 2020, pp. 01-05, https://doi.org/10.53555/nnms.v7i1.789.