1. Fréchet differentiability of convex functions;Asplund, Edgar;Acta Math.,1968
2. 2. J. Aubin and J. Siegel, Fixed points and stationary points of dissipative multivalued maps, M.R. report 7712, University of Southern California, Los Angeles, 1977.
3. Weak local supportability and applications to approximation;Borwein, J. M.;Pacific J. Math.,1979
4. 4. M. Crandall, 1976, personal communication.
5. Farthest points of sets in uniformly convex Banach spaces;Edelstein, Michael;Israel J. Math.,1966