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1. IANGV.(2010).Natural Gas Vehicle Statistics; SUMMARY DATA 2010 (EOY), from: http://www.iangv.org/tools-resources/statistics.html.
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2. IANGV.(2010). Natural Gas Vehicle Statistics; NGV Count - Ranked Numerically As at December 2010.from: http://www.iangv.org/tools-resources/statistics.html.
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9. Starling, K.E. & Savidge, J.L.(1992). AGA Transmission Measurement Committee Report Number 8, second ed., American Gas Association, Virginia, USA.
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