@article{NAM_1925_6_1__68_0,
     author = {Nielsen, Niels},
     title = {Sur une s\'erie de Lagrange},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {68--73},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {6e s{\'e}rie, 1},
     year = {1925},
     language = {fr},
     url = {www.numdam.org/item/NAM_1925_6_1__68_0/}
}