1. Engineering Analysis;Crandall,1956
2. The Principle and Applications of Variational Methods;Becker,1964
3. The Method of Weighted Residuals and Variational Principles;Finlayson,1972
4. Advances in Computer Methods for Partial Differential Equations;Jensen,1975
5. Proc. Third Conf. Matrix Methods in Struct. Mech.;Oliveira,1971