Submitted on: 19 January 2014.
Revised on: 22 April 2014.
Accepted on: 15 June 2014.
___________________Journal of Natural Gas Science and Engineering
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Submitted on: 30 November 2001.
Revised on: 12 February 2002.
Accepted on: 28 March 2002.
___________________Journal of Natural Gas Science and Engineering
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