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Submitted on: 09 September 2004.
Revised on: 18 October 2004.
Accepted on: 08 November 2004.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
Submitted on: 17 December 2003.
Revised on: 09 April 2004.
Accepted on: 04 June 2004.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
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Submitted on: 17 March 2008.
Revised on: 29 May 2008.
Accepted on: 22 June 2008.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
Submitted on: 01 July 1998.
Revised on: 22 September 1998.
Accepted on: 26 October 1998.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
Submitted on: 20 October 2012.
Revised on: 13 January 2013.
Accepted on: 24 January 2013.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
Submitted on: 30 November 2010.
Revised on: 10 March 2011.
Accepted on: 24 April 2011.
___________________Journal of Physics-Complexity---IOP PUBLISHING LTD
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