@incollection{SB_1969-1970__12__1_0,
     author = {Berger, Marcel},
     title = {Le th\'eor\`eme de {Gromoll-Meyer} sur les g\'eod\'esiques ferm\'ees},
     booktitle = {S\'eminaire Bourbaki : vol. 1969/70, expos\'es 364-381},
     series = {S\'eminaire Bourbaki},
     note = {talk:364},
     pages = {1--17},
     publisher = {Springer-Verlag},
     number = {12},
     year = {1971},
     zbl = {0216.43902},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1969-1970__12__1_0/}
}