TY  - JOUR
AU  - Krzysztof Prażmowski
TI  - Groups of squares and half-equivalences in geometry
JO  - Colloquium Mathematicum
PY  - 1987
SP  - 157
EP  - 168
VL  - 53
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-53-2-157-168/
DO  - 10.4064/cm-53-2-157-168
LA  - en
ID  - 10_4064_cm_53_2_157_168
ER  -