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PNN 28.10.2011
PNN 23.07.2008
PNN 05 July 2006
PORTAL July 2005, p 32
PORTAL April 2005, p 38
PORTAL February 2004
PORTAL April 2003, p 2 right
PORTAL April 2002, p 4 left
PORTAL December 2001, p 4
Pressemitteilung 039 1999
