@article{SM_1987_58_1_a13,
     author = {B. R. Vainberg},
     title = {Parametrix and asymptotics of the spectral function of differential operators in~$\mathbf R^n$},
     journal = {Sbornik. Mathematics},
     pages = {245--265},
     year = {1987},
     volume = {58},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1987_58_1_a13/}
}