@incollection{AST_1973__2-3__244_0,
     author = {Kohn, J. J.},
     title = {Propagation of singularities for $\bar \partial$},
     booktitle = {Colloque International C.N.R.S. sur les \'equations aux d\'eriv\'ees partielles lin\'eaires},
     series = {Ast\'erisque},
     pages = {244--251},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {2-3},
     year = {1973},
     mrnumber = {390533},
     zbl = {0272.35054},
     language = {en},
     url = {http://www.numdam.org/item/AST_1973__2-3__244_0/}
}