Submitted on: 20 November 2007.
Revised on: 14 December 2007.
Accepted on: 25 December 2007.
___________________CLASSICAL WORLD---JOHNS HOPKINS UNIV PRESS
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Submitted on: 24 July 2008.
Revised on: 11 September 2008.
Accepted on: 15 October 2008.
___________________CLASSICAL WORLD---JOHNS HOPKINS UNIV PRESS