Estimates in the $H_{(s)}$ norms, and hypoellipticity
Doklady Akademii Nauk, Tome 193 (1970) no. 2, pp. 301-303.

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@article{DAN_1970_193_2_a13,
     author = {V. S. Fedii},
     title = {Estimates in the $H_{(s)}$ norms, and hypoellipticity},
     journal = {Doklady Akademii Nauk},
     pages = {301--303},
     publisher = {mathdoc},
     volume = {193},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_2_a13/}
}
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V. S. Fedii. Estimates in the $H_{(s)}$ norms, and hypoellipticity. Doklady Akademii Nauk, Tome 193 (1970) no. 2, pp. 301-303. http://geodesic.mathdoc.fr/item/DAN_1970_193_2_a13/