Submitted on: 13 April 2011.
Revised on: 11 June 2011.
Accepted on: 29 July 2011.
___________________Biofuels-UK---TAYLOR & FRANCIS LTD
Submitted on: 08 November 2002.
Revised on: 31 December 2002.
Accepted on: 20 February 2003.
___________________Biofuels-UK---TAYLOR & FRANCIS LTD
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