1. Sobolev Spaces;Adams,1978
2. Lectures on Elliptic Boundary Value Problems;Agmon,1965
3. Estimates near the boundary for solutions of elliptic partial differential equations satisfying general boundary conditions, I;Agmon;Comm. Pure Appl. Math.,1959
4. Poincare-Steklou's operators and domain decomposition methods in finite dimensional spaces;Agoshkov,1988
5. Fixed point equations and nonlinear eigenvalue problems in ordered Banach spaces;Amann;SIAM Rev.,1976