@incollection{XUPS_1996____99_0,
     author = {Douady, Adrien},
     title = {Le doublement de l{\textquoteright}angle},
     booktitle = {Aspects des syst\`emes dynamiques~: le premier retour},
     series = {Journ\'ees math\'ematiques X-UPS},
     pages = {99--115},
     publisher = {Les \'Editions de l{\textquoteright}\'Ecole polytechnique},
     year = {1996},
     doi = {10.5802/xups.1996-05},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.5802/xups.1996-05/}
}