Geodesic
Asymptotic distribution of eigenvalues for hypoelliptic systems in~$R^n$
Sbornik. Mathematics, Tome 28 (1976) no. 4, pp. 533-552

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General symmetric hypoelliptic systems of differential operators in $R^n$ with discrete spectrum are considered. Two-sided estimates, as $t\to\infty$, are found for $N(t)$, the number of eigenvalues in the interval $[0,t]$. Under a regularity assumption on the behavior of the spectrum of the Weyl matrix symbol of the system, these estimates reduce to the asymptotics of $N(t)$ with an estimate of the remainder term. In part the results are also new for the scalar case. Bibliography: 9 titles. 
@article{SM_1976_28_4_a6,
     author = {V. I. Feigin},
     title = {Asymptotic distribution of eigenvalues for hypoelliptic systems in~$R^n$},
     journal = {Sbornik. Mathematics},
     pages = {533--552},
     publisher = {mathdoc},
     volume = {28},
     number = {4},
     year = {1976},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1976_28_4_a6/}
}
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V. I. Feigin. Asymptotic distribution of eigenvalues for hypoelliptic systems in~$R^n$. Sbornik. Mathematics, Tome 28 (1976) no. 4, pp. 533-552. http://geodesic.mathdoc.fr/item/SM_1976_28_4_a6/