%0 Journal Article %A B. R. Vainberg %T Parametrix and asymptotics of the spectral function of differential operators inĀ $\mathbf R^n$ %J Sbornik. Mathematics %D 1987 %P 245-265 %V 58 %N 1 %U http://geodesic.mathdoc.fr/item/SM_1987_58_1_a13/ %G en %F SM_1987_58_1_a13