Krishnaswamy, D., and M. Velmurugan. “Partial Ordering of Block Matrices in Minkowski Space”. Communications in Mathematics and Applications 12, no. 4 (December 13, 2021): 1013–1023. Accessed August 18, 2025. https://www.journals.rgnpublications.com/index.php/cma/article/view/1605.