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Submitted on: 19 February 2013.
Revised on: 27 May 2013.
Accepted on: 25 June 2013.
___________________Analytical Methods---ROYAL SOC CHEMISTRY
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Submitted on: 27 October 2008.
Revised on: 04 February 2009.
Accepted on: 22 February 2009.
___________________Analytical Methods---ROYAL SOC CHEMISTRY