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- Brazil, Nov 2007
- Stanford, Jun 2007
- Stuttgart, Nov 2006
- Cape Town, Jul 2006
- Oxford, Nov 2005
- Kyoto, July 2005
- Taipei Tech., Apr 2005
- Firenze, Nov 2004
- Paris, June 2004
- Beijing, Oct 2003
- Vienna, June 2003
- Torino, Oct 2002
- Canberra, May 2002
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Paris, Oct 2001
- Venezia, May 2001
- Dattwil, Oct 2000
- Paris, May 2000
- Bergen, Nov 1999
- Washington, May 1999
- Antalya, Oct 1998
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