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Un terme etrange venu d’ailleurs. (French) Zbl 0496.35030
Nonlinear partial differential equations and their applications, Coll. de France Semin., Vol. II, Res. Notes Math. 60, 98-138 (1982).

MSC:
35J35 Variational methods for higher-order elliptic equations
35B20 Perturbations in context of PDEs
35B30 Dependence of solutions to PDEs on initial and/or boundary data and/or on parameters of PDEs
35A35 Theoretical approximation in context of PDEs