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Submitted on: 19 October 2021.
Revised on: 16 December 2021.
Accepted on: 27 January 2022.
___________________JOURNAL OF GEOMETRY AND PHYSICS
Submitted on: 16 September 2017.
Revised on: 06 November 2017.
Accepted on: 13 December 2017.
___________________JOURNAL OF GEOMETRY AND PHYSICS
Submitted on: 29 September 1998.
Revised on: 04 December 1998.
Accepted on: 07 January 1999.
___________________JOURNAL OF GEOMETRY AND PHYSICS
Submitted on: 19 March 2010.
Revised on: 13 April 2010.
Accepted on: 24 May 2010.
___________________JOURNAL OF GEOMETRY AND PHYSICS
Submitted on: 11 March 2012.
Revised on: 31 March 2012.
Accepted on: 12 April 2012.
___________________JOURNAL OF GEOMETRY AND PHYSICS
Submitted on: 15 October 2014.
Revised on: 08 February 2015.
Accepted on: 10 March 2015.
___________________JOURNAL OF GEOMETRY AND PHYSICS
Submitted on: 05 June 1998.
Revised on: 04 August 1998.
Accepted on: 29 August 1998.
___________________JOURNAL OF GEOMETRY AND PHYSICS
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