@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}, year = {1977}, pages = {88-116}, mrnumber = {81g:58035}, zbl = {0388.47031}, language = {fr}, url = {http://dml.mathdoc.fr/item/JEDP_1977____88_0} }
Helffer, Bernard. Quelques exemples d'opérateurs pseudodifférentiels localement résolubles. Journées équations aux dérivées partielles, (1977), pp. 88-116. http://gdmltest.u-ga.fr/item/JEDP_1977____88_0/
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