Submitted on: 04 September 2009.
Revised on: 20 December 2009.
Accepted on: 02 January 2010.
___________________Journal of the Scientific Society
Submitted on: 16 March 1998.
Revised on: 23 June 1998.
Accepted on: 06 July 1998.
___________________Journal of the Scientific Society
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Submitted on: 02 May 1998.
Revised on: 19 June 1998.
Accepted on: 27 July 1998.
___________________Journal of the Scientific Society
Submitted on: 02 March 2004.
Revised on: 18 May 2004.
Accepted on: 08 July 2004.
___________________Journal of the Scientific Society