Guo, Bai-Ni. “Three Proofs of an Identity Involving Derivatives of a Positive Definite Matrix and Its Determinant”. CUBO, A Mathematical Journal 5, no. 2 (June 1, 2003): 225–229. Accessed January 30, 2026. https://cubo.ufro.cl/index.php/cubo/article/view/1696.