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Submitted on: 20 March 2020.
Revised on: 22 April 2020.
Accepted on: 15 May 2020.
PRAMANA-JOURNAL OF PHYSICS---INDIAN ACAD SCIENCES
Submitted on: 13 July 2005.
Revised on: 01 August 2005.
Accepted on: 17 August 2005.
PRAMANA-JOURNAL OF PHYSICS---INDIAN ACAD SCIENCES
Submitted on: 06 September 2010.
Revised on: 21 September 2010.
Accepted on: 10 October 2010.
PRAMANA-JOURNAL OF PHYSICS
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