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@article{MMO_1967_16_a3, author = {Yu. V. Egorov}, title = {Hypoelliptic pseudodifferential operators}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {99--108}, publisher = {mathdoc}, volume = {16}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1967_16_a3/} }
Yu. V. Egorov. Hypoelliptic pseudodifferential operators. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 16 (1967), pp. 99-108. http://geodesic.mathdoc.fr/item/MMO_1967_16_a3/