@article{JMPA_1932_9_11__109_0,
     author = {F\'eraud, Lucien},
     title = {Stabilit\'es et p\'eriodicit\'e au voisinage d'un point d'\'equilibre},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {109--130},
     publisher = {Gauthier-Villars},
     volume = {9e s{\'e}rie, 11},
     year = {1932},
     zbl = {0005.22301},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1932_9_11__109_0/}
}