@article{JMPA_1905_6_1__97_0,
     author = {Ermakoff, W.},
     title = {Calcul des variations d'apr\`es {Weierstrass}},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {97--137},
     publisher = {Gauthier-Villars},
     volume = {6e s{\'e}rie, 1},
     year = {1905},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1905_6_1__97_0/}
}