@incollection{JEDP_1980____A18_0,
     author = {Grigis, Alain},
     title = {Propagation des singularit\'es sur des groupes de {Lie} nilpotents},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {18},
     pages = {1--3},
     publisher = {\'Ecole polytechnique},
     year = {1980},
     zbl = {0501.22013},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/JEDP_1980____A18_0/}
}