@article{NAM_1867_2_6__489_1,
     author = {Cayla, Ch.},
     title = {Concours d'admission \`a {l'\'Ecole} normale sup\'erieure (ann\'ee 1867). {Composition} math\'ematique},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {489--492},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {2e s{\'e}rie, 6},
     year = {1867},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1867_2_6__489_1/}
}