Submitted on: 19 March 1999.
Revised on: 18 April 1999.
Accepted on: 21 May 1999.
___________________Engineering Research Express---IOP PUBLISHING LTD
Submitted on: 04 July 2019.
Revised on: 24 September 2019.
Accepted on: 19 October 2019.
___________________Engineering Research Express---IOP PUBLISHING LTD
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Submitted on: 05 October 2004.
Revised on: 24 December 2004.
Accepted on: 12 January 2005.
___________________Engineering Research Express---IOP PUBLISHING LTD
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Submitted on: 07 June 2004.
Revised on: 29 August 2004.
Accepted on: 10 October 2004.
___________________Engineering Research Express---IOP PUBLISHING LTD
Submitted on: 22 February 2016.
Revised on: 26 March 2016.
Accepted on: 24 April 2016.
___________________Engineering Research Express---IOP PUBLISHING LTD
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Submitted on: 31 October 2004.
Revised on: 05 January 2005.
Accepted on: 01 February 2005.
___________________Engineering Research Express---IOP PUBLISHING LTD