Submitted on: 08 October 2020.
Revised on: 13 November 2020.
Accepted on: 21 November 2020.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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Submitted on: 09 September 1999.
Revised on: 14 October 1999.
Accepted on: 30 October 1999.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Submitted on: 16 October 2006.
Revised on: 20 November 2006.
Accepted on: 09 December 2006.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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