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Author comment for 1973PhDT.........8B:

The full text of this thesis is also available from the author's home institution at the URL http://e-collection.ethbib.ethz.ch/cgi-bin/show.pl?type=extdiss&nr=7

Author comment submitted on 13 March, 2007 by Arnold Benz (benz@astro.phys.ethz.ch)