1. The Hadamard-Cartan theorem in locally convex metric spaces;Alexander;Enseign. Math.,1990
2. S.B. Alexander and R.L. Bishop, Thin Riemannian manifolds with boundary, Preprint.
3. The Riemannian obstacle problem;Alexander;Illinois J. Math.,1987
4. Geometric curvature bounds in Riemannian manifolds with boundary;Alexander;Trans. Amer. Math. Soc.,1993
5. A theorem on triangles in a metric space and some of its applications;Alexandrov;Trudy Mat. Inst. Steklov,1951