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@article{MAN_1977__231_163057, author = {A. Menikoff}, title = {Pseudo-differential {Operators} with {Double} {Characteristics.}}, journal = {Mathematische Annalen}, pages = {145--180}, publisher = {mathdoc}, volume = {231}, year = {1977}, zbl = {0364.35050}, url = {http://geodesic.mathdoc.fr/item/MAN_1977__231_163057/} }
A. Menikoff. Pseudo-differential Operators with Double Characteristics.. Mathematische Annalen, Tome 231 (1977), pp. 145-180. http://geodesic.mathdoc.fr/item/MAN_1977__231_163057/