@article{JEDP_1977____157_0, author = {Menikoff, A. and Sj\"ostrand, Johannes}, title = {The eigenvalues of hypoelliptic operators}, journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, pages = {157--163}, publisher = {Ecole polytechnique}, year = {1977}, language = {en}, url = {http://www.numdam.org/item/JEDP_1977____157_0/} }
Menikoff, A.; Sjöstrand, Johannes. The eigenvalues of hypoelliptic operators. Journées équations aux dérivées partielles (1977), pp. 157-163. http://www.numdam.org/item/JEDP_1977____157_0/
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