Submitted on: 11 June 2014.
Revised on: 23 August 2014.
Accepted on: 23 September 2014.
___________________AIP Advances---AIP PUBLISHING
Submitted on: 04 February 2004.
Revised on: 10 April 2004.
Accepted on: 22 April 2004.
___________________AIP Advances---AIP PUBLISHING
Submitted on: 14 November 2002.
Revised on: 19 December 2002.
Accepted on: 30 January 2003.
___________________AIP Advances---AIP PUBLISHING
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Submitted on: 08 July 1999.
Revised on: 02 November 1999.
Accepted on: 16 December 1999.
___________________AIP Advances---AIP PUBLISHING
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