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Un terme etrange venu d’ailleurs. II. (French) Zbl 0498.35034
Nonlinear partial differential equations and their applications, Coll. de France Semin., Vol. III, Res. Notes Math. 70, 154-178 (1982).

35J20 Variational methods for second-order elliptic equations
35B25 Singular perturbations in context of PDEs
49J40 Variational inequalities
35A15 Variational methods applied to PDEs