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1998PhDT........24K Author Comment Author comment for 1998PhDT........24K:

The full text of this thesis is also available from the author's home institution at the URL http://star-www.dur.ac.uk:80/~haraldk/pubs.html Author comment submitted 12-Sep-2000 by Harald Kuntschner (harald.kuntschner@durham.ac.uk)