@article{NAM_1899_3_18__121_1,
     author = {B\"oklen, O.},
     title = {Sur les normales de l'ellipso{\"\i}de},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {121--125},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {3e s{\'e}rie, 18},
     year = {1899},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1899_3_18__121_1/}
}