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2008 Apr 18: Torsten Ehrhardt (Æ÷Ç×°ø´ë); A Banach algebra method and its application to the asymptotics of determinants 

2013 Mar 29: Torsten Ehrhardt(Univ. of Santa Curtz); Resultant matrices and inversion of Bezoutians?

2013 Jun 28: Torsten Ehrhardt(Univ. of Santa Curtz); On the invertibility of Toeplitz-plus-Hankel operators