%0 Journal Article
%A W. M. Pieper 
%T Multifocal Surfaces and Algorithms for Displaying Them
%J Journal for geometry and graphics
%D 2006
%P 37-62
%V 10
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JGG_2006_10_1_JGG_2006_10_1_a3/
%F JGG_2006_10_1_JGG_2006_10_1_a3