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@article{DAN_1966_168_6_a4, author = {Yu. V. Egorov}, title = {Hypoelliptic pseudodifferential operators}, journal = {Doklady Akademii Nauk}, pages = {1242--1244}, publisher = {mathdoc}, volume = {168}, number = {6}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1966_168_6_a4/} }
Yu. V. Egorov. Hypoelliptic pseudodifferential operators. Doklady Akademii Nauk, Tome 168 (1966) no. 6, pp. 1242-1244. http://geodesic.mathdoc.fr/item/DAN_1966_168_6_a4/