1973 Frankfurt, Germany
1976 Paris, France
1976 Köln, Germany
1982 Köln, Germany
1990 Köln, Germany
1990 Gelsenkirchen, Germany
1995 Köln, Germany
1998 Düsseldorf, Germany
1999 Köln, Germany
2003 München, Germany
2003 Oberhausen, Germany
2003 Hannover, Germany
2003, Amsterdam, Netherlands
2003, Zürich, Austria
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2006 Brüssel, Belgien
2006 Köln, Germany
2006 ???????
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