[1] H.H. Bauschke and P.L. Combettes, Convex Analysis and Monotone Operators Theory in Hilbert Spaces, Springer, New York, 2011.
[2] H.H. Bauschke, R. Goebel, Y. Lucet and X. Wang, The proximal average: Basic theory, SIAM J. Optim., 19(2) (2008), 766-785.
[3] R. Bhatia, Matrix Analysis, Springer, New York, 1997.
[4] J.M. Borwein and A.S. Lewis, Convex Analysis and Nonlinear Optimization, Springer, New York, 2006.
[5] J.M. Borwein and Q. Zhu, Techniques of Variational Analysis, CMS/Springer, New York, 2005.
[6] A. Daniilidis, A.S. Lewis, J. Malick and H. Sendov, Prox-regularity of spectral functions and spectral sets, J. Convex Anal., 15(3) (2008), 547-560.
[7] A.S. Lewis, Convex analysis on the Hermitian matrices, SIAM J. Optim., 6(1) (1996), 164-177.
[8] A.S. Lewis, Derivatives of spectral functions, Math. Oper. Res., 21(3) (1996), 576-588.
[9] A.S. Lewis, Nonsmooth analysis of eigenvalues, Math. Program., 84(1-24) (1999), 1-24.
[10] A.S. Lewis, Twice differentiable of spectral functions, SIAM J. Matrix Anal. Appl., 23(2) (2001), 368-386.
[11] H. Mohebi, Analysis of symmetric matrix valued functions I, Nonlinear Anal., Theory Methods Appl., 69(1) (2008), 110-125.
[12] H. Mohebi and A. Salemi, Analysis of symmetric matrix valued functions, Numer. Funct. Anal. Optim., 28(5-6) (2007), 691-715.
[13] A.M. Rubinov, Abstract Convexity and Global Optimization, Kluwer Academic Publishers, Dordrecht-Boston-London, 2000.