@misc{BSMA_1884_2_8_1_254_1,
     title = {Extrait d'une lettre de {M.} {Bougaief}},
     journal = {Bulletin des Sciences Math\'ematiques et Astronomiques},
     pages = {254--256},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 8},
     number = {1},
     year = {1884},
     language = {fr},
     url = {http://archive.numdam.org/item/BSMA_1884_2_8_1_254_1/}
}