Spectral study of a coupled compact-noncompact problem
ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 26 (1992) no. 6, p. 659-672 
@article{M2AN_1992__26_6_659_0,
     author = {Benkaddour, A. and Sanchez-Hubert, J.},
     title = {Spectral study of a coupled compact-noncompact problem},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
     publisher = {Dunod},
     volume = {26},
     number = {6},
     year = {1992},
     pages = {659-672},
     zbl = {0759.76067},
     mrnumber = {1183412},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1992__26_6_659_0}
}

Benkaddour, A.; Sanchez-Hubert, J. Spectral study of a coupled compact-noncompact problem. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 26 (1992) no. 6, pp. 659-672. http://www.numdam.org/item/M2AN_1992__26_6_659_0/

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