@article{DE_1989_25_1_a0,
     author = {R. R. Ashurov},
     title = {An asymptotic estimate in $L_2$ for the {Riesz} means of the spectral function of an elliptic operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {3--14},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_1_a0/}
}