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Perturbation methods. (English) Zbl 0265.35002
Pure and Applied Mathematics. A Wiley-Interscience Publication. New York etc.: John Wiley & Sons. XII, 425 p. £9.00 (1973).

MSC:
35-02 Research exposition (monographs, survey articles) pertaining to partial differential equations
35B20 Perturbations in context of PDEs
35B25 Singular perturbations in context of PDEs