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1987 Article ​

1994 Article ​

1994-03-15 Thesis ​

1997 Article ​

1999 Article ​

2000 Article ​

2001 Article ​

2005 Article ​

2009 Article ​

2010 Article ​

2012-06-21 Article ​

2012-09 Conf. Object ​

2012-09-13 Article ​

2013 Article ​

2013 Article ​

2013-05 Article ​

2014-06 DFP ​

2014-06 DFP ​

2014-09 DFP ​

2015-06 DFP ​

2016 Article ​

2016-01-11 Thesis ​

2016-06 DFP ​

2017-06 DFP ​