Submitted on: 06 July 2009.
Revised on: 30 July 2009.
Accepted on: 06 August 2009.
THEORY OF COMPUTING SYSTEMS
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Submitted on: 27 November 2013.
Revised on: 25 December 2013.
Accepted on: 21 January 2014.
THEORY OF COMPUTING SYSTEMS
Submitted on: 19 November 2001.
Revised on: 12 December 2001.
Accepted on: 20 December 2001.
THEORY OF COMPUTING SYSTEMS