@incollection{SB_1984-1985__27__89_0,
     author = {Risler, Jean-Jacques},
     title = {Complexit\'e et g\'eom\'etrie r\'eelle},
     booktitle = {S\'eminaire Bourbaki : volume 1984/85, expos\'es 633-650},
     series = {Ast\'erisque},
     note = {talk:637},
     pages = {89--100},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {133-134},
     year = {1986},
     mrnumber = {837216},
     zbl = {0589.32020},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1984-1985__27__89_0/}
}