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1989PhDT.......132G Author Comment Author comment for 1989PhDT.......132G:

The full text of this thesis is also available from the author's home institution at the URL http://www.ub.es/spub/pubs/t0956.htm<>/A>

Author comment submitted 30-Sep-2000 by Enrique Gaztanaga (gazta@inaoep.mx)