Vijay Karamcheti C. Li Igor Pechtchanski Chee-Keng Yap A Core Library for Robust Numeric and Geometric Computation. 351-359 1999 Symposium on Computational Geometry http://doi.acm.org/10.1145/304893.304989 db/conf/compgeom/compgeom99.html#KaramchetiLPY99