Submitted on: 25 September 2019.
Revised on: 04 November 2019.
Accepted on: 19 November 2019.
MODERN PHYSICS LETTERS B
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Submitted on: 04 March 1999.
Revised on: 14 March 1999.
Accepted on: 20 March 1999.
MODERN PHYSICS LETTERS B---WORLD SCIENTIFIC PUBL CO PTE LTD
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Submitted on: 04 December 2006.
Revised on: 04 January 2007.
Accepted on: 18 January 2007.
MODERN PHYSICS LETTERS B