TY  - JOUR
AU  - J.B. Büchi
AU  - J.B. Wright
TI  - The Theory of Proportionality as an Abstraction of Group Theory.
JO  - Mathematische Annalen
PY  - 1955
SP  - 102
EP  - 108
VL  - 130
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1955__130_160454/
ID  - MAN_1955__130_160454
ER  -