@article{RM_1983_38_1_a25,
     author = {G. S. Popov and M. A. Shubin},
     title = {A~complete asymptotic expansion of the spectral function for second-order elliptic operators in~$\mathbb R^n$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {213--214},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1983_38_1_a25/}
}