Table of contents

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Author: Doris Folini and Rolf Walder

E-mail: folini@astro.phys.ethz.ch

Homepage: http://www.astro.phys.ethz.ch/staff/folini

Further information:
Presentation at the atelier numerique at the Observatoire de Paris Meudon, September 5, 2002, Copyright by Doris Folini and Rolf Walder