Notes on the Complexity of Exact View Graph Algorithms for Piecewise Smooth Algebraic Surfaces.

J. H. Rieger Notes on the Complexity of Exact View Graph Algorithms for Piecewise Smooth Algebraic Surfaces. 205-229 1998 20 Discrete & Computational Geometry 2 http://dx.doi.org/10.1007/PL00009383 db/journals/dcg/dcg20.html#Rieger98