Geodesic
Hypoelliptic differential equations and pseudodifferential operators with operator-valued symbols
Sbornik. Mathematics, Tome 17 (1972) no. 4, pp. 497-514

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Sufficient conditions are established for the hypoellipticity of pseudodifferential operators with operator-valued symbols. These results are used to prove the hypoellipticity of new classes of linear partial differential equations. Bibliography: 43 titles. 
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     author = {V. V. Grushin},
     title = {Hypoelliptic differential equations and pseudodifferential operators with operator-valued symbols},
     journal = {Sbornik. Mathematics},
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     volume = {17},
     number = {4},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_17_4_a2/}
}
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V. V. Grushin. Hypoelliptic differential equations and pseudodifferential operators with operator-valued symbols. Sbornik. Mathematics, Tome 17 (1972) no. 4, pp. 497-514. http://geodesic.mathdoc.fr/item/SM_1972_17_4_a2/