Submitted on: 29 July 2015.
Revised on: 27 August 2015.
Accepted on: 11 September 2015.
MODERN PHYSICS LETTERS A
Submitted on: 16 November 1998.
Revised on: 01 December 1998.
Accepted on: 12 December 1998.
MODERN PHYSICS LETTERS A---WORLD SCIENTIFIC PUBL CO PTE LTD
Submitted on: 06 August 2010.
Revised on: 18 August 2010.
Accepted on: 03 September 2010.
MODERN PHYSICS LETTERS A---WORLD SCIENTIFIC PUBL CO PTE LTD
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