@article{JEDP_1977____88_0, author = {Helffer, Bernard}, title = {Quelques exemples d'op\'erateurs pseudodiff\'erentiels localement r\'esolubles}, journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, pages = {88--116}, publisher = {Ecole polytechnique}, year = {1977}, mrnumber = {81g:58035}, zbl = {0388.47031}, language = {fr}, url = {http://www.numdam.org/item/JEDP_1977____88_0/} }
Helffer, Bernard. Quelques exemples d'opérateurs pseudodifférentiels localement résolubles. Journées équations aux dérivées partielles (1977), pp. 88-116. http://www.numdam.org/item/JEDP_1977____88_0/
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