TY  - JOUR
AU  - Gerhard X. Ritter
TI  - On fixed point free involutions of $R^1 × S^2$
JO  - Colloquium Mathematicum
PY  - 1976
SP  - 237
EP  - 240
VL  - 36
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-36-2-237-240/
DO  - 10.4064/cm-36-2-237-240
LA  - en
ID  - 10_4064_cm_36_2_237_240
ER  -