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Submitted on: 24 August 2000.
Revised on: 02 October 2000.
Accepted on: 13 October 2000.
MODERN PHYSICS LETTERS A---WORLD SCIENTIFIC PUBL CO PTE LTD
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Submitted on: 09 May 2014.
Revised on: 26 May 2014.
Accepted on: 20 June 2014.
MODERN PHYSICS LETTERS A
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Submitted on: 30 September 2000.
Revised on: 12 October 2000.
Accepted on: 06 November 2000.
MODERN PHYSICS LETTERS A---WORLD SCIENTIFIC PUBL CO PTE LTD