Kim, Sung Guen. “Numerical Radius Points of ${\mathcal L}(^m l_{\infty}^n:L_{\infty}^n)$”.
New Zealand Journal of Mathematics
53 (October 12, 2022): 1–10. Accessed December 8, 2022. https://nzjmath.org/index.php/NZJMATH/article/view/179.