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Submitted on: 25 August 2005.
Revised on: 09 October 2005.
Accepted on: 27 November 2005.
___________________Journal of Computer Languages---ELSEVIER SCI LTD
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Submitted on: 02 March 2010.
Revised on: 26 June 2010.
Accepted on: 20 August 2010.
___________________Journal of Computer Languages---ELSEVIER SCI LTD
Submitted on: 21 June 2002.
Revised on: 20 August 2002.
Accepted on: 13 September 2002.
___________________Journal of Computer Languages---ELSEVIER SCI LTD
Submitted on: 15 November 2004.
Revised on: 08 January 2005.
Accepted on: 10 February 2005.
___________________Journal of Computer Languages---ELSEVIER SCI LTD
Submitted on: 30 October 2000.
Revised on: 27 February 2001.
Accepted on: 27 April 2001.
___________________Journal of Computer Languages---ELSEVIER SCI LTD