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Perturbation of spectral properties for a class of stiff problems. (English) Zbl 0448.35078
Computing methods in applied sciences and engineering, Proc. 4th int. Symp., Versailles 1979, 683-697 (1980).

MSC:
35P05 General topics in linear spectral theory for PDEs
35J99 Elliptic equations and elliptic systems
35B20 Perturbations in context of PDEs