1. Abatzoglou, T., Continuity of Metric Projection in Uniformly Convex and Uniformly Smooth Banach spaces. J. Approx Theory 39 (1983), 299–307
2. Ya. I. Al'ber and Notik A. I., Geometric Properties of Banach Spaces and Approximate Method for Solving Nonlinear Operator Equations, Soviet Math. Dokl. 29(1984), 611–615.
3. Bjornestal, B. O., Local Lipschitz Continuity of the Metric Proiection Operator, Preprint
4. Lecture Notes in Mathematics;J. Diestel,1975
5. Goebel, K. and Reich, S., Uniform Convexity, Hyperbolic Geometry and Nonexpansive Mappings, Marcel Dekker, Inc., 1984.