Geodesic
The spectrum of an elliptic equation
Matematičeskie zametki, Tome 11 (1972) no. 5, pp. 577-583 
V. G. Mishin. The spectrum of an elliptic equation. Matematičeskie zametki, Tome 11 (1972) no. 5, pp. 577-583. http://geodesic.mathdoc.fr/item/MZM_1972_11_5_a12/
@article{MZM_1972_11_5_a12,
     author = {V. G. Mishin},
     title = {The spectrum of an elliptic equation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {577--583},
     year = {1972},
     volume = {11},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_11_5_a12/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper we consider conditions for the presence or absence of spectral points in the left complex halfplane of a general second-order elliptic operator.