TY  - JOUR
AU  - W. M. Pieper 
TI  - Multifocal Surfaces and Algorithms for Displaying Them
JO  - Journal for geometry and graphics
PY  - 2006
SP  - 37
EP  - 62
VL  - 10
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JGG_2006_10_1_JGG_2006_10_1_a3/
ID  - JGG_2006_10_1_JGG_2006_10_1_a3
ER  -