Rashid, Mohammad M.H. “Some Inequalities for the Numerical Radius and Spectral Norm for Operators in Hilbert $C^{\ast}$-Modules Space”. Tamkang Journal of Mathematics (April 30, 2024). Accessed July 3, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/5167.