TY  - JOUR
AU  - Ping-Fun Lam
TI  - Discrete and continuous flows of characteristic $O^±$
JO  - Fundamenta Mathematicae
PY  - 1976
SP  - 141
EP  - 147
VL  - 92
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-92-2-141-147/
DO  - 10.4064/fm-92-2-141-147
LA  - en
ID  - 10_4064_fm_92_2_141_147
ER  -