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Variational methods for eigenvalue approximation. (English) Zbl 0296.49033
CBMS-NSF Regional Conference Series in Applied Mathematics. 15. Philadelphia, Pa.: SIAM, Society for Industrial and Applied Mathematics. V, 160 p. (1974).

49R50 Variational methods for eigenvalues of operators (MSC2000)
35P15 Estimates of eigenvalues in context of PDEs
49-02 Research exposition (monographs, survey articles) pertaining to calculus of variations and optimal control