TY  - JOUR
AU  - J. Wallner 
TI  - On a Problem of Elementary Differential Geometry and the Number of its Solutions
JO  - Journal for geometry and graphics
PY  - 2006
SP  - 155
EP  - 16
VL  - 10
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JGG_2006_10_2_JGG_2006_10_2_a3/
ID  - JGG_2006_10_2_JGG_2006_10_2_a3
ER  -