@article{DAN_1961_140_5_a8,
     author = {V. P. Palamodov},
     title = {On the theory of hypo-elliptic and partially hypo-elliptic operators},
     journal = {Doklady Akademii Nauk},
     pages = {1015--1018},
     publisher = {mathdoc},
     volume = {140},
     number = {5},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_140_5_a8/}
}