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Submitted on: 29 March 2004.
Revised on: 05 May 2004.
Accepted on: 22 May 2004.
___________________INTERNATIONAL JOURNAL OF PARALLEL PROGRAMMING
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Submitted on: 24 January 1998.
Revised on: 15 February 1998.
Accepted on: 01 April 1998.
___________________INTERNATIONAL JOURNAL OF PARALLEL PROGRAMMING
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