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Singular perturbations. (Perturbations singulières.) (French) Zbl 0137.29902

C. R. Acad. Sci., Paris 258, 6320-6322 (1964); 259, 4213-4215 (1964); 260, 6800-6801 (1965).

MSC:

35B25 Singular perturbations in context of PDEs
35J60 Nonlinear elliptic equations
47F05 General theory of partial differential operators
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