TY  - JOUR
AU  - Jurga, Rastislav
TI  - The cross-ratio in Hjelmslev planes
JO  - Mathematica Bohemica
PY  - 1997
SP  - 243
EP  - 247
VL  - 122
IS  - 3
PB  - mathdoc
UR  - https://geodesic-test.mathdoc.fr/articles/10.21136/MB.1997.126149/
DO  - 10.21136/MB.1997.126149
LA  - en
ID  - 10_21136_MB_1997_126149
ER  -