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@article{DAN_1966_171_4_a3, author = {Yu. V. Egorov}, title = {On pseudo-differential operators of the principal type}, journal = {Doklady Akademii Nauk}, pages = {778--780}, publisher = {mathdoc}, volume = {171}, number = {4}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1966_171_4_a3/} }
Yu. V. Egorov. On pseudo-differential operators of the principal type. Doklady Akademii Nauk, Tome 171 (1966) no. 4, pp. 778-780. http://geodesic.mathdoc.fr/item/DAN_1966_171_4_a3/