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2000Sci...287...95Y Author Comment Author comment for 2000Sci...287...95Y:

The full text of this article is also available from the author's home institution at the URL http://www.physics.usyd.edu.au/~wardle/Reprints/2000Science_GC_review.pdf

Author comment submitted 11-May-2000 by M. Wardle (wardle@physics.usyd.edu.au)