@incollection{JEDP_1978____A12_0, author = {M\'etivier, Guy}, title = {Propri\'et\'e des it\'er\'es et ellipticit\'e}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {12}, pages = {1--2}, publisher = {Ecole polytechnique}, year = {1978}, mrnumber = {80f:35047}, language = {fr}, url = {http://archive.numdam.org/item/JEDP_1978____A12_0/} }