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1999PhDT.........8A Author Comment Author comment for 1999PhDT.........8A:

The full text of this thesis is also available from the author's home institution at the URL http://tonno.tesre.bo.cnr.it/~amati/tesi.html

Author comment submitted 30-Nov-2000 by Lorenzo Amati (amati@tesre.bo.cnr.it)