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Author comment for 2006PhDT.........8H:

The full text of this thesis is also available from the author's home institution at the URL http://hss.ulb.uni-bonn.de/diss_online/math_nat_fak/2007/hetterscheidt_marco

Author comment submitted on 8 March, 2007 by Marco Hetterscheidt (mhetter@astro.uni-bonn.de)