@incollection{JEDP_1981____A6_0,
     author = {Bolley, Pierre and Camus, Jacques and Nourrigat, Jean},
     title = {La condition de {H\"ormander-Kohn} pour les op\'erateurs pseudo-diff\'erentiels},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {6},
     pages = {1--9},
     publisher = {Ecole polytechnique},
     year = {1981},
     zbl = {0481.35085},
     language = {fr},
     url = {http://www.numdam.org/item/JEDP_1981____A6_0/}
}