St Petersburg, 16-23 June 2002
Kai talking (1 | 2)
Kai reading
Suny & Kai
Contact Topology
Workshop 19-22 February 2003
John, Kai & Tobias
John, Kai, Tobias, Klaus & Sewa
100 Jahre Poincare-Vermutung, 6 June 2005 (1 | 2 | 3)
Hoher Fricken, 10 July 2005
Aufstieg
Nebel
Gipfel
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