Submitted on: 24 March 2012.
Revised on: 03 April 2012.
Accepted on: 10 April 2012.
Opsearch
Submitted on: 20 July 2008.
Revised on: 06 August 2008.
Accepted on: 18 August 2008.
Opsearch---SPRINGER INDIA
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Submitted on: 06 July 2013.
Revised on: 05 August 2013.
Accepted on: 31 August 2013.
Opsearch
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