Geodesic
Asymptotic distribution of eigenvalues
Izvestiya. Mathematics , Tome 21 (1983) no. 1, pp. 119-160

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The method of a spectral almost-projection is employed to investigate the masymptotic behavior of the eigenvalue distribution functions of semibounded essentially selfadjoint systems of differential operators in a domain and of pseudodifferential operators on $R^n$. Use is made of the calculus of pseudodifferential operators with dual symbols constructed in the article. Bibliography: 27 titles. 
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     author = {S. Z. Levendorskii},
     title = {Asymptotic distribution of eigenvalues},
     journal = {Izvestiya. Mathematics },
     pages = {119--160},
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     volume = {21},
     number = {1},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1983_21_1_a4/}
}
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S. Z. Levendorskii. Asymptotic distribution of eigenvalues. Izvestiya. Mathematics , Tome 21 (1983) no. 1, pp. 119-160. http://geodesic.mathdoc.fr/item/IM2_1983_21_1_a4/