\begin{thebibliography}{1}

\bibitem{xsplines}
Carole Blanc and Christophe Schlick.
\newblock X-splines : A spline model designed for the end-user.
\newblock In {\em Proc. SIGGRAPH'95, Computer Graphics}, pages 377--386, 1995.

\bibitem{numrecipes}
W.~H. Press, Q.~A. Teukolsky, W.~T. Vetterling, and B.~P. Flannery.
\newblock {\em Numerical recipes in FORTRAN}, chapter 13.10.
\newblock Cambridge University Press, 1992.

\bibitem{algo626}
A.~Preusser.
\newblock Computing contours by successive solution of quintic polynomial
  equations,.
\newblock {\em ACM TOMS}, 10(4), 1984.

\end{thebibliography}
