@article{NAM_1849_1_8__139_1,
     author = {Lebesgue},
     title = {Sur l'hexagramme mystique},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {139--142},
     publisher = {Bachelier},
     volume = {1e s{\'e}rie, 8},
     year = {1849},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1849_1_8__139_1/}
}