Zarnan, Jumah, and Milko Petkov. “Lower Bounds for the Module of Determinants of Block Diagonally Matrices”. Ann. Sofia Univ. Fac. Math. and Inf. 86, no. 1 (December 12, 1994): 5–9. Accessed January 16, 2025. https://admin.uni-sofia.bg/index.php/fmi/article/view/428.