@incollection{SB_1979-1980__22__156_0,
     author = {Desolneux-Moulis, Nicole},
     title = {Orbites p\'eriodiques des syst\`emes hamiltoniens autonomes},
     booktitle = {S\'eminaire Bourbaki : vol. 1979/80, expos\'es 543-560},
     series = {S\'eminaire Bourbaki},
     note = {talk:552},
     pages = {156--173},
     publisher = {Springer-Verlag},
     number = {22},
     year = {1981},
     mrnumber = {636522},
     zbl = {0479.58008},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1979-1980__22__156_0/}
}