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@article{MAN_1955__130_160454, author = {J.B. B\"uchi and J.B. Wright}, title = {The {Theory} of {Proportionality} as an {Abstraction} of {Group} {Theory.}}, journal = {Mathematische Annalen}, pages = {102--108}, publisher = {mathdoc}, volume = {130}, year = {1955}, zbl = {0065.00902}, url = {http://geodesic.mathdoc.fr/item/MAN_1955__130_160454/} }
J.B. Büchi; J.B. Wright. The Theory of Proportionality as an Abstraction of Group Theory.. Mathematische Annalen, Tome 130 (1955), pp. 102-108. http://geodesic.mathdoc.fr/item/MAN_1955__130_160454/