Ploymukda, Arnon, and Pattrawut Chansangiam. “Hölder Type Inequalities Involving Tracy-Singh Products and Khatri-Rao Products of Hilbert Space Operators”. Communications in Mathematics and Applications 10, no. 3 (September 30, 2019): 531–540. Accessed April 25, 2024. http://www.rgnpublications.com/journals/index.php/cma/article/view/1227.