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Submitted on: 12 December 2012.
Revised on: 08 January 2013.
Accepted on: 17 January 2013.
Science & Education
Submitted on: 13 November 2014.
Revised on: 07 December 2014.
Accepted on: 25 December 2014.
Science & Education
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Submitted on: 07 November 2015.
Revised on: 09 December 2015.
Accepted on: 21 December 2015.
Science & Education
Submitted on: 06 January 2003.
Revised on: 16 February 2003.
Accepted on: 03 March 2003.
Science & Education---SPRINGER