@article{NAM_1904_4_4__97_0,
     author = {Greenhill, A.-G.},
     title = {Le pendule simple sans approximations},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {97--105},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {4e s{\'e}rie, 4},
     year = {1904},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1904_4_4__97_0/}
}