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In 2000 P. Speelman published four Journal - Articles. In 2001 P. Speelman published two Journal - Articles. In 2002 P. Speelman published seven Journal - Articles. In 2003 P. Speelman published four Journal - Articles. In 2004 P. Speelman published two Journal - Articles. In 2005 P. Speelman published one Journal - Article. In 2010 P. Speelman published one Journal - Article. In 2011 P. Speelman published one Journal - Article.