@article{AIHP_1939__9_1_1_0,
     author = {Morse, Marston},
     title = {Sur le calcul des variations},
     journal = {Annales de l'institut Henri Poincar\'e},
     pages = {1--11},
     publisher = {INSTITUT HENRI POINCAR\'E ET GAUTHIER-VILLARS},
     volume = {9},
     number = {1},
     year = {1939},
     zbl = {0021.03403},
     language = {fr},
     url = {http://www.numdam.org/item/AIHP_1939__9_1_1_0/}
}