R. Bhatia, Matrix Analysis, 1997.
DOI : 10.1007/978-1-4612-0653-8

R. A. Horn and C. Johnson, Topics in Matrix Analysis, 1991.
DOI : 10.1017/CBO9780511840371

M. Schechter, Principles of Functional Analysis, 1971.
DOI : 10.1090/gsm/036

C. Zãlinescu, Convex Analysis In General Vector Spaces, 2002.
DOI : 10.1142/5021

F. Zhang, Matrix Theory Basic Results and Techniques, 2013.

L. N. Trefethen and D. Bau, Numerical Linear Algebra, Part I: Lectures 4-5, SIAM, 1997.

M. Godberg, Numerical radius of positive matrices, Linear Algebra and its Applications, vol.12, issue.3, pp.209-214, 1975.
DOI : 10.1016/0024-3795(75)90042-7