@article{SMJ_1938-1939__6__A6_0,
     author = {Roger, Fr\'ed\'eric},
     title = {Classification des extr\'emales (d'apr\`es les travaux de {M.} {Morse} et prolongements)},
     journal = {S\'eminaire de Math\'ematiques dit de Julia},
     note = {talk:6},
     pages = {1--20},
     publisher = {\'Ecole Normale Sup\'erieure},
     volume = {6},
     year = {1938-1939},
     language = {fr},
     url = {http://archive.numdam.org/item/SMJ_1938-1939__6__A6_0/}
}