@article{ASENS_1865_1_2__55_0,
     author = {Darboux, G.},
     title = {Recherches sur les surfaces orthogonales},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {55--69},
     publisher = {Elsevier},
     volume = {1e s{\'e}rie, 2},
     year = {1865},
     doi = {10.24033/asens.12},
     mrnumber = {1508514},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/asens.12/}
}