@article{AIHPC_1990__7_6_525_0,
     author = {Brousseau, V.},
     title = {Espaces de {Krein} et index des syst\`emes hamiltoniens},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {525--560},
     publisher = {Gauthier-Villars},
     volume = {7},
     number = {6},
     year = {1990},
     mrnumber = {1079571},
     zbl = {0719.58030},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPC_1990__7_6_525_0/}
}