TY  - JOUR
AU  - Y. Ke
AU  - Joseph O'Rourke
TI  - Lower Bounds on Moving a Ladder in Two and Three Dimensions.
JO  - Discrete & computational geometry
PY  - 1988
SP  - 197
EP  - 218
VL  - 3
IS  - 1-2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DCG_1988__3_1-2_131046/
ID  - DCG_1988__3_1-2_131046
ER  -