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Singularly perturbed differential equations. (English) Zbl 0522.35003
Mathematical Research, 13. Berlin: Akademie-Verlag. 176 p. DDR M 22.00 (1983).

35-02 Research exposition (monographs, survey articles) pertaining to partial differential equations
35B25 Singular perturbations in context of PDEs
35J40 Boundary value problems for higher-order elliptic equations
35K50 Systems of parabolic equations, boundary value problems (MSC2000)
35C20 Asymptotic expansions of solutions to PDEs
35A35 Theoretical approximation in context of PDEs