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2001 Article ​

2005 Article ​

2005 Article ​

2006 Article ​

2007 Article ​

2007 Article ​

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2009-11-13 Conf. Object ​

2009-12-10 Article ​

2010 Article ​

2011-06 Conf. Object ​

2013-07-18 Thesis ​

2014 Article ​