Kim, S. G. “Extreme and Exposed Points of L(^n l^2_∞ ) and L_s (^n l^2_∞)”. Extracta Mathematicae, Vol. 35, no. 2, Dec. 2020, p. 127-35, https://publicaciones.unex.es/index.php/EM/article/view/2605-5686.35.2.127.