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Methods of intermediate problems for eigenvalues. Theory and ramifications. (English) Zbl 0291.49034
Mathematics in Science and Engineering. Vol. 89. New York - London: Academic Press. XI, 236 p. $ 14.50 (1972).

49R50 Variational methods for eigenvalues of operators (MSC2000)
47B25 Linear symmetric and selfadjoint operators (unbounded)
34L99 Ordinary differential operators
35J20 Variational methods for second-order elliptic equations
49-02 Research exposition (monographs, survey articles) pertaining to calculus of variations and optimal control