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2000PhDT.........2T Author Comment Author comment for 2000PhDT.........2T:

The full text of this thesis is also available from the author's home institution at the URL http://stesun8.stelab.nagoya-u.ac.jp/~tanuma/study/ph_d.html Author comment submitted 13-Sep-2000 by Syuniti Tanuma (tanuma@stelab.nagoya-u.ac.jp)