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Author comment for 2007PhDT........10K:

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/kraus_stefan/index.htm

Author comment submitted on 3 December, 2007 by Stefan Kraus (skraus@mpifr-bonn.mpg.de).