Submitted on: 27 May 2003.
Revised on: 05 July 2003.
Accepted on: 15 August 2003.
___________________Journal of Mathematical Physics Analysis Geometry
Submitted on: 19 January 2001.
Revised on: 20 March 2001.
Accepted on: 06 April 2001.
___________________Journal of Mathematical Physics Analysis Geometry
Submitted on: 16 September 2011.
Revised on: 24 October 2011.
Accepted on: 16 December 2011.
___________________Journal of Mathematical Physics Analysis Geometry
Submitted on: 25 August 2003.
Revised on: 15 November 2003.
Accepted on: 18 December 2003.
___________________Journal of Mathematical Physics Analysis Geometry
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Submitted on: 03 November 2005.
Revised on: 17 February 2006.
Accepted on: 14 April 2006.
___________________Journal of Mathematical Physics Analysis Geometry
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