TY  - JOUR
AU  - Röschel, Otto
TI  - Double points on characteristics
JO  - Applications of Mathematics
PY  - 1995
SP  - 381
EP  - 390
VL  - 40
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/AM.1995.134301/
DO  - 10.21136/AM.1995.134301
LA  - en
ID  - 10_21136_AM_1995_134301
ER  -