@article{NAM_1845_1_4__142_0,
     author = {Charpentier, H.},
     title = {De la lemniscate hyperbolique},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {142--146},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {1e s{\'e}rie, 4},
     year = {1845},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1845_1_4__142_0/}
}