@article{NAM_1886_3_5__177_0,
     author = {De Saint-Germain},
     title = {Sur la d\'etermination g\'eom\'etrique des brachistochrones},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {177--185},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {3e s{\'e}rie, 5},
     year = {1886},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1886_3_5__177_0/}
}