Geodesic
A Class of Hypoelliptic Pseudodifferential Operators with Double Characteristics.
Mathematische Annalen, Tome 217 (1975), pp. 165-188.

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@article{MAN_1975__217_162768,
     author = {Lars H\"ormander},
     title = {A {Class} of {Hypoelliptic} {Pseudodifferential} {Operators} with {Double} {Characteristics.}},
     journal = {Mathematische Annalen},
     pages = {165--188},
     publisher = {mathdoc},
     volume = {217},
     year = {1975},
     zbl = {0306.35032},
     url = {http://geodesic.mathdoc.fr/item/MAN_1975__217_162768/}
}
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%A Lars Hörmander
%T A Class of Hypoelliptic Pseudodifferential Operators with Double Characteristics.
%J Mathematische Annalen
%D 1975
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%V 217
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Lars Hörmander. A Class of Hypoelliptic Pseudodifferential Operators with Double Characteristics.. Mathematische Annalen, Tome 217 (1975), pp. 165-188. http://geodesic.mathdoc.fr/item/MAN_1975__217_162768/