Thomas W. Sederberg Eng-Wee Chionh The Algebra and Geometry of Curve and Surface Inversion. 11- 2002 conf/gmp/2002 GMP http://csdl.computer.org/comp/proceedings/gmp/2002/1674/00/16740011abs.htm db/conf/gmp/gmp2002.html#SederbergC02