@article{AIHP_1949__11_5_241_0,
     author = {Birkhoff, Garrett},
     title = {Groupes r\'eticul\'es},
     journal = {Annales de l'institut Henri Poincar\'e},
     publisher = {INSTITUT HENRI POINCAR\'E ET GAUTHIER-VILLARS},
     volume = {11},
     number = {5},
     year = {1949},
     pages = {241-250},
     zbl = {0034.01902},
     mrnumber = {34770},
     language = {fr},
     url = {http://www.numdam.org/item/AIHP_1949__11_5_241_0}
}

Birkhoff, Garrett. Groupes réticulés. Annales de l'institut Henri Poincaré, Volume 11 (1949) no. 5, pp. 241-250. http://www.numdam.org/item/AIHP_1949__11_5_241_0/