Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1931__105_159515, author = {F. Klein}, title = {Zur {Theorie} der abstrakten {Verkn\"upfungen}}, journal = {Mathematische Annalen}, pages = {308--324}, publisher = {mathdoc}, volume = {105}, year = {1931}, zbl = {57.0057.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1931__105_159515/} }
F. Klein. Zur Theorie der abstrakten Verknüpfungen. Mathematische Annalen, Tome 105 (1931), pp. 308-324. http://geodesic.mathdoc.fr/item/MAN_1931__105_159515/