Geodesic
Spectral asymptotics of nonselfadjoint elliptic systems of differential operators on bounded domains
Sbornik. Mathematics, Tome 71 (1992) no. 2, pp. 517-531

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In a bounded domain $\Omega\subset R_n$ with smooth boundary, a matrix elliptic differential operator $A$ is considered. It is assumed that the eigenvalues of the symbol of $A$ lie on the positive semiaxis $R^+$ and outside the angle $\Phi=\{z\colon\left|\arg z\right|\leqslant\varphi\}$, $\varphi\in(0,\pi)$. 
@article{SM_1992_71_2_a15,
     author = {K. Kh. Boimatov and A. G. Kostyuchenko},
     title = {Spectral asymptotics of nonselfadjoint elliptic systems of differential operators on bounded domains},
     journal = {Sbornik. Mathematics},
     pages = {517--531},
     publisher = {mathdoc},
     volume = {71},
     number = {2},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1992_71_2_a15/}
}
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K. Kh. Boimatov; A. G. Kostyuchenko. Spectral asymptotics of nonselfadjoint elliptic systems of differential operators on bounded domains. Sbornik. Mathematics, Tome 71 (1992) no. 2, pp. 517-531. http://geodesic.mathdoc.fr/item/SM_1992_71_2_a15/