1983

	1984
	1987
	1988
	1989
	1991
	1995
	1997
	1999
	1999
	1999
	2000
	2001
	2002
	2003
	2004
	2005
	2005
	2005 ( at work with Gijs Assmann)
	2005
	2005
	2006
	2006
	2006
	2006
	2008
	2009
	2010
	2011

	2011
	2011