Kim, Sung Guen. “Extreme Points of ${\mathcal L}_s(^2l_{\infty})$ and ${\mathcal P}(^2l_{\infty})$”. Carpathian Mathematical Publications 13, no. 2 (July 24, 2021): 289–297. Accessed November 24, 2024. https://ktipe.pnu.edu.ua/index.php/cmp/article/view/4326.