@article{BSMF_1885__13__95_1,
     author = {Humbert, G.},
     title = {Sur les surfaces homofocales du second ordre},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {95--119},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {13},
     year = {1885},
     doi = {10.24033/bsmf.296},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.296/}
}