Submitted on: 14 March 2000.
Revised on: 03 April 2000.
Accepted on: 10 April 2000.
MODERN PHYSICS LETTERS A---WORLD SCIENTIFIC PUBL CO PTE LTD
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Submitted on: 30 July 2003.
Revised on: 15 August 2003.
Accepted on: 24 August 2003.
MODERN PHYSICS LETTERS A
Submitted on: 11 September 2012.
Revised on: 28 September 2012.
Accepted on: 13 October 2012.
MODERN PHYSICS LETTERS A
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