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1996 Article ​

1996 Article ​

1996 Article ​

1998-02-27 Thesis ​

1999 Article ​

2001 Article ​

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2006 Article ​

2006-01 DFP ​

2006-06 DFP ​

2006-12-15 Thesis ​

2007 Article ​

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2008-06-02 Conf. Object ​

2008-10-17 Thesis ​

2009 Article ​