Institute for Analysis and Numerical Mathematics,
Johannes Kepler University Linz,
Altenberger Str. 69, A - 4040 Linz, Austria.
e-mail: kuhn@numa.uni-linz.ac.at.
Acknowledgment: This work is supported by the Austrian Science Fund
- 'Fonds zur Förderung der wissenschaftlichen Forschung' -
under project P 11215-TEC.
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