@article{FAA_1983_17_3_a4,
     author = {G. S. Popov and M. A. Shubin},
     title = {Asymptotic expansion of the spectral function for second-order elliptic operators in $\mathbb{R}^n$},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {37--45},
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1983_17_3_a4/}
}