Submitted on: 28 December 2012.
Revised on: 28 March 2013.
Accepted on: 18 April 2013.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
Submitted on: 20 May 2016.
Revised on: 30 August 2016.
Accepted on: 13 September 2016.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
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Submitted on: 26 June 2001.
Revised on: 21 October 2001.
Accepted on: 04 November 2001.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
Submitted on: 09 September 2011.
Revised on: 24 November 2011.
Accepted on: 24 December 2011.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
Submitted on: 01 November 2017.
Revised on: 25 November 2017.
Accepted on: 16 December 2017.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
Submitted on: 08 November 2012.
Revised on: 21 January 2013.
Accepted on: 03 February 2013.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
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