@article{NAM_1856_1_15__297_1,
     author = {Bertrand, George},
     title = {Solution de la question 320},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {297--298},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {1e s{\'e}rie, 15},
     year = {1856},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1856_1_15__297_1/}
}