1. An Analysis of the Finite Element Method;Strang,1973
2. The change in solution due to change in domain;Strang,1971
3. Qualitative Methods in Quantum Theory;Migdal,1977
4. T. Betcke, L.N. Trefethen, Reviving the method of particular solutions, Preprint.
5. Approximations and bounds for eigenvalues of elliptic operators;Fox;SIAM J. Numer. Analysis,1967