@article{DAN_1963_152_3_a2,
     author = {V. N. Gorchakov},
     title = {On the asymptotic behaviour of the spectral function of a class of hypo-elliptic operators},
     journal = {Doklady Akademii Nauk},
     pages = {519--522},
     publisher = {mathdoc},
     volume = {152},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_3_a2/}
}