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Submitted on: 05 June 1999.
Revised on: 14 July 1999.
Accepted on: 13 August 1999.
___________________Journal of High Energy Astrophysics
Submitted on: 23 September 2010.
Revised on: 19 December 2010.
Accepted on: 22 January 2011.
___________________Journal of High Energy Astrophysics
Submitted on: 30 July 2014.
Revised on: 10 October 2014.
Accepted on: 14 November 2014.
___________________Journal of High Energy Astrophysics
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