Submitted on: 04 December 1998.
Revised on: 03 January 1999.
Accepted on: 02 March 1999.
___________________Journal of Geometry and Symmetry in Physics
Submitted on: 05 February 2019.
Revised on: 08 April 2019.
Accepted on: 13 May 2019.
___________________Journal of Geometry and Symmetry in Physics
Submitted on: 12 December 2018.
Revised on: 30 January 2019.
Accepted on: 26 February 2019.
___________________Journal of Geometry and Symmetry in Physics
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Submitted on: 16 April 2018.
Revised on: 11 June 2018.
Accepted on: 08 July 2018.
___________________Journal of Geometry and Symmetry in Physics
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