Laurent Dupont Daniel Lazard Sylvain Lazard Sylvain Petitjean Near-optimal parameterization of the intersection of quadrics: I. The generic algorithm. 168-191 2008 43 J. Symb. Comput. 3 http://dx.doi.org/10.1016/j.jsc.2007.10.006 db/journals/jsc/jsc43.html#DupontLLP08