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\section*{Authors}

Michael Hoffmann, ETH Z\"urich.\\
Dmitrii Pasechnik, Delft University of Technology.\\
Wieger Wesselink, Utrecht University.

\section*{Acknowledgement}

This work was supported by the ESPRIT IV LTR Projects No.~21957 (CGAL)
and No. 28155 (GALIA).

