1. Borwein, J.M., Fitzpatrick, S.: Existence of nearest points in Banach spaces. Can. J. Math. 41, 702–720 (1989)
2. Chu, C-H., Kim, K-T., Kim, S.: Infinite dimensional holomorphic homogeneous regular domains, J. Geom. Anal. 30, 223–247 (2020) arXiv:1808.03416
3. Dunford, N., Schwartz, J.T.: Linear Operators. Wiley Classics Library Edition, New York (1988)