@article{VMUMM_1987_3_a23,
     author = {A. M. Lopatnikov},
     title = {Asymptotic behavior of the spectral function for operators constructed from vector fields},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {76--78},
     publisher = {mathdoc},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_3_a23/}
}