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In 2003 G.M. Schippers published one Journal - Article. In 2005 G.M. Schippers published one Journal - Article. In 2006 G.M. Schippers published two Journal - Articles. In 2007 G.M. Schippers published one Journal - Article. In 2008 G.M. Schippers published two Journal - Articles. In 2009 G.M. Schippers published four Journal - Articles. In 2010 G.M. Schippers published three Journal - Articles. In 2011 G.M. Schippers published one Journal - Article. In 2012 G.M. Schippers published one Journal - Article. In 2017 G.M. Schippers published one Journal - Article.