@article{HM_1988_1988_1_a4,
     author = {Dou, Alberto},
     title = {Or{\'\i}genes del c\'alculo de variaciones.},
     journal = {Historia de la Matem\'atica},
     pages = {113-151},
     publisher = {mathdoc},
     year = {1988},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/HM_1988_1988_1_a4/}
}