@article{SEDP_1973-1974____A23_0,
     author = {Duistermaat, J. J.},
     title = {L'indice de {Morse} dans le calcul variationnel},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:25},
     pages = {1--13},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1973-1974},
     mrnumber = {426038},
     zbl = {0302.49031},
     language = {fr},
     url = {http://archive.numdam.org/item/SEDP_1973-1974____A23_0/}
}