@article{RM_1973_28_5_a17,
     author = {V. N. Tulovskii and M. A. Shubin},
     title = {The asymptotic behavior of the eigenvalues of pseudodifferential operators in $L^2(\mathbf R^n)$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {28},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1973_28_5_a17/}
}