@incollection{JEDP_1976____A13_0, author = {Pham The Lai}, title = {Th\'eorie spectrale d'une classe d'op\'erateurs diff\'erentiels hypoelliptiques}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {13}, pages = {1--59}, publisher = {Ecole polytechnique}, year = {1976}, language = {fr}, url = {http://archive.numdam.org/item/JEDP_1976____A13_0/} }
Pham The Lai. Théorie spectrale d'une classe d'opérateurs différentiels hypoelliptiques. Journées équations aux dérivées partielles (1976), article no. 13, 59 p. http://archive.numdam.org/item/JEDP_1976____A13_0/
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