@incollection{JEDP_1986____A12_0, author = {Rodino, Luigi}, title = {Propagation of singularities and local solvability in {Gevrey} classes}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {12}, pages = {1--11}, publisher = {Ecole polytechnique}, year = {1986}, language = {en}, url = {http://archive.numdam.org/item/JEDP_1986____A12_0/} }