%0 Journal Article
%A J.B. Büchi
%A J.B. Wright
%T The Theory of Proportionality as an Abstraction of Group Theory.
%J Mathematische Annalen
%D 1955
%P 102-108
%V 130
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1955__130_160454/
%F MAN_1955__130_160454