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- Bernd Billhardt, University of Kassel, Germany, 8 -28 March
and 7-20 September 2008.
- Ralph
Matthes, CNRS and Université de Toulouse III, France, 11-17 May 2008.
- Robert Hartwig, North
Carolina State University, USA, 3-30 September 2008.
- Mária
Szendrei, Bolyai Institute, University of Szeged, Hungary, 9-19
November 2008.
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