Submitted on: 07 December 2006.
Revised on: 15 December 2006.
Accepted on: 22 December 2006.
PHYSICA B-CONDENSED MATTER
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Submitted on: 27 October 1998.
Revised on: 03 December 1998.
Accepted on: 25 December 1998.
PHYSICA B-CONDENSED MATTER
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Submitted on: 04 October 1999.
Revised on: 30 October 1999.
Accepted on: 13 November 1999.
PHYSICA B-CONDENSED MATTER---ELSEVIER
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Submitted on: 09 April 2009.
Revised on: 16 May 2009.
Accepted on: 21 May 2009.
PHYSICA B-CONDENSED MATTER---ELSEVIER