Submitted on: 29 October 2011.
Revised on: 21 February 2012.
Accepted on: 14 April 2012.
___________________Journal of Mathematical Physics Analysis Geometry
Submitted on: 22 April 2014.
Revised on: 11 June 2014.
Accepted on: 30 July 2014.
___________________Journal of Mathematical Physics Analysis Geometry
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Submitted on: 23 December 2000.
Revised on: 20 January 2001.
Accepted on: 01 February 2001.
___________________Journal of Mathematical Physics Analysis Geometry
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