The eigenvalues of hypoelliptic operators
Journées équations aux dérivées partielles (1977), pp. 157-163. 
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     author = {A. Menikoff and Johannes Sj\"ostrand},
     title = {The eigenvalues of hypoelliptic operators},
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     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     pages = {157--163},
     publisher = {\'Ecole polytechnique},
     year = {1977},
     doi = {10.5802/jedp.163},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/articles/10.5802/jedp.163/}
}
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A. Menikoff; Johannes Sjöstrand. The eigenvalues of hypoelliptic operators. Journées équations aux dérivées partielles (1977), pp. 157-163. doi : 10.5802/jedp.163. https://proceedings.centre-mersenne.org/articles/10.5802/jedp.163/

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