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@article{MAN_1931__104_159462, author = {R.C. Young}, title = {The algebra of many-valued quantities}, journal = {Mathematische Annalen}, pages = {260--290}, publisher = {mathdoc}, volume = {104}, year = {1931}, zbl = {0001.01102}, url = {http://geodesic.mathdoc.fr/item/MAN_1931__104_159462/} }
R.C. Young. The algebra of many-valued quantities. Mathematische Annalen, Tome 104 (1931), pp. 260-290. http://geodesic.mathdoc.fr/item/MAN_1931__104_159462/