Geodesic
The eigenvalues of hypoelliptic operators
Journées équations aux dérivées partielles (1977), pp. 157-163.

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Menikoff, A.; Sjöstrand, Johannes. The eigenvalues of hypoelliptic operators. Journées équations aux dérivées partielles (1977), pp. 157-163. http://geodesic.mathdoc.fr/item/JEDP_1977____157_0/

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