@misc{BSMA_1870__1__254_1,
     title = {Acad\'emie des {Sciences.} {Concours} de l'ann\'ee 1869},
     journal = {Bulletin des Sciences Math\'ematiques et Astronomiques},
     pages = {254--264},
     publisher = {Gauthier-Villars},
     volume = {1},
     year = {1870},
     language = {fr},
     url = {http://www.numdam.org/item/BSMA_1870__1__254_1/}
}