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Author comment for 2006PhDT........25P:

The full text of this thesis is also available from the author's home institution at the URL http://www.ph1.uni-koeln.de/workgroups/eckart/publications/theses/2006_PhD_Pott_Joerg-Uwe.pdf

Author comment submitted on 24 April, 2007 by Richard Mathar (mathar@strw.leidenuniv.nl).