@article{NAM_1923_5_2__281_0,
     author = {Pomey, L\'eon},
     title = {Sur une extension des s\'eries de {Bertrand}},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {281--283},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {5e s{\'e}rie, 2},
     year = {1923},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1923_5_2__281_0/}
}