1. The support functionals of a convex set;Bishop,1962
2. An extension to the theorem of Bishop and Phelps;Bollobás;Bull. London Math. Soc.,1970
3. Numerical range;Bonsall;Lecture Notes of the London Mathematics, Society,1971
4. On the subdifferentiability of convex functions;Brøndsted,1965
5. On the Fredholm alternative for nonlinear operators;Browder;Bull. Amer. Math. Soc.,1970