@article{JSFS_1880__21__309_0,
     author = {Gr\'eard, O.},
     title = {L'enseignement secondaire \`a {Paris} en 1880},
     journal = {Journal de la Soci\'et\'e de statistique de Paris},
     pages = {309--325},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {21},
     year = {1880},
     language = {fr},
     url = {http://archive.numdam.org/item/JSFS_1880__21__309_0/}
}