@article{NAM_1863_2_2__152_1,
     author = {Hans, E.},
     title = {Solutions des questions 638 et 639},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {152--156},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {2e s{\'e}rie, 2},
     year = {1863},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1863_2_2__152_1/}
}