@article{NAM_1920_4_20__13_0,
     author = {d'Ocagne, M.},
     title = {Simple remarque sur la cyclide de {Dupin}},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {13--14},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {4e s{\'e}rie, 20},
     year = {1920},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1920_4_20__13_0/}
}