Ploymukda, Arnon, and Pattrawut Chansangiam. “Refinements and Reverses of Operator Callebaut Inequality Involving Tracy-Singh Products and Khatri-Rao Products”. Communications in Mathematics and Applications 9, no. 4 (December 25, 2018): 529–540. Accessed November 24, 2024. http://rgnpublications.com/journals/index.php/cma/article/view/1096.