Geodesic
Riesz means of the distribution function of the eigenvalues of an elliptic operator
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 19, Tome 163 (1987), pp. 143-145 Cet article a éte moissonné depuis la source Math-Net.Ru

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Let $N(\lambda)$ be the distribution function of eigenvalues of a elliptic operator. We investigate the asymptotics of the Eiesz means of $N(\lambda)$ when $\lambda\to\infty$. Under some assumptions (they are fulfilled, in particular, for Laplace operator) we obtaine the nest term of asymptotics in comparison with known formulas. 
@article{ZNSL_1987_163_a11,
     author = {Yu. G. Safarov},
     title = {Riesz means of the distribution function of the eigenvalues of an elliptic operator},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {143--145},
     year = {1987},
     volume = {163},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_163_a11/}
}
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Yu. G. Safarov. Riesz means of the distribution function of the eigenvalues of an elliptic operator. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 19, Tome 163 (1987), pp. 143-145. http://geodesic.mathdoc.fr/item/ZNSL_1987_163_a11/