C. S., Preethi, Minikumari N. S., and Jeeja A. V. “\(\mathcal{D}\)-Squares and \(E\)-Squares”. Communications in Mathematics and Applications 12, no. 1 (March 31, 2021): 213–219. Accessed November 22, 2024. http://rgnpublications.com/journals/index.php/cma/article/view/1456.