Geodesic
On the Eigenvalue of a Class of Hypoelliptic Operators.
Mathematische Annalen, Tome 235 (1978), pp. 55-86.

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@article{MAN_1978__235_163144,
     author = {A. Menikoff and J. Sj\"ostrand},
     title = {On the {Eigenvalue} of a {Class} of {Hypoelliptic} {Operators.}},
     journal = {Mathematische Annalen},
     pages = {55--86},
     publisher = {mathdoc},
     volume = {235},
     year = {1978},
     zbl = {0375.35014},
     url = {http://geodesic.mathdoc.fr/item/MAN_1978__235_163144/}
}
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AU  - J. Sjöstrand
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EP  - 86
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%A J. Sjöstrand
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%D 1978
%P 55-86
%V 235
%I mathdoc
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A. Menikoff; J. Sjöstrand. On the Eigenvalue of a Class of Hypoelliptic Operators.. Mathematische Annalen, Tome 235 (1978), pp. 55-86. http://geodesic.mathdoc.fr/item/MAN_1978__235_163144/