An exact algebraic predicate for maintaining the topology of the voronoi diagram for circles.

Francois Anton David G. Kirkpatrick Darka Mioc An exact algebraic predicate for maintaining the topology of the voronoi diagram for circles. 72-76 2002 CCCG http://www.cs.uleth.ca/~wismath/cccg/papers/21.ps db/conf/cccg/cccg2002.html#AntonKM02