1. Manifolds, Tensor Analysis and Applications;Abraham,2001
2. Fréchet differentiability of convex functions;Asplund;Acta Math.,1968
3. Optimization and Nonsmooth Analysis;Clarke,1990
4. Nonsmooth Analysis and Control Theory;Clarke,1998
5. Variational inequalities and regularity properties of closed sets in Hilbert spaces;Colombo;J. Convex Anal.,2001