Francois Anton Ioannis Z. Emiris Bernard Mourrain Monique Teillaud The Offset to an Algebraic Curve and an Application to Conics. 683-696 2005 conf/iccsa/2005-1 ICCSA (1) http://dx.doi.org/10.1007/11424758_71 db/conf/iccsa/iccsa2005-1.html#AntonEMT05