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This is to certify that your paper entitled «Determination of IRANIAN exported natural gas quality and its enforcing in price at gas sales and purchase contracts» was indexed with 20 pages, in the CIVILICA citation database, code COI:IGEC02_031, after evaluation and approval of the referees of the "02nd Iran held in Tehran 2008.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.