@incollection{AST_1993__217__119_0,
     author = {Hanges, Nicholas and Treves, Fran\c{c}ois},
     title = {On the local holomorphic extension of $CR$ functions},
     booktitle = {Colloque d'analyse complexe et g\'eom\'etrie - Marseille, janvier 1992},
     series = {Ast\'erisque},
     pages = {119--137},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {217},
     year = {1993},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1993__217__119_0/}
}