Submitted on: 17 August 2002.
Revised on: 30 September 2002.
Accepted on: 12 October 2002.
Light & Engineering---ZNACK PUBLISHING HOUSE
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Submitted on: 10 January 2017.
Revised on: 29 January 2017.
Accepted on: 03 February 2017.
Light & Engineering---ZNACK PUBLISHING HOUSE
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Submitted on: 25 July 2010.
Revised on: 04 August 2010.
Accepted on: 17 August 2010.
Light & Engineering---ZNACK PUBLISHING HOUSE