@article{SM_1983_45_2_a1,
     author = {V. I. Bezyaev},
     title = {Asymptotics of the eigenvalues of hypoelliptic operators on a closed manifold},
     journal = {Sbornik. Mathematics},
     pages = {169--189},
     publisher = {mathdoc},
     volume = {45},
     number = {2},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1983_45_2_a1/}
}