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Submitted on: 27 October 2019.
Revised on: 25 November 2019.
Accepted on: 18 December 2019.
MODERN PHYSICS LETTERS B---WORLD SCIENTIFIC PUBL CO PTE LTD
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Submitted on: 31 December 2007.
Revised on: 31 January 2008.
Accepted on: 19 February 2008.
MODERN PHYSICS LETTERS B
Submitted on: 10 January 2010.
Revised on: 08 February 2010.
Accepted on: 26 February 2010.
MODERN PHYSICS LETTERS B---WORLD SCIENTIFIC PUBL CO PTE LTD
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