Avi Zulti Adi Levin David Levin Mina Teicher <i>C</i><sup>2</sup> subdivision over triangulations with one extraordinary point. 157-178 2006 23 Computer Aided Geometric Design 2 http://dx.doi.org/10.1016/j.cagd.2005.06.001 db/journals/cagd/cagd23.html#ZultiLLT06