@article{JMPA_1876_3_2__411_0,
     author = {Gyld\'en, Hugo},
     title = {Extrait d'une {Lettre} \`a {M.} {Hermite,} relative \`a l'application des fonctions elliptiques \`a la th\'eorie des perturbations},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {411--419},
     publisher = {Gauthier-Villars},
     volume = {3e s{\'e}rie, 2},
     year = {1876},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1876_3_2__411_0/}
}