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This is to certify that your paper entitled «Prediction of H2S Concentration in Gas Sweetening Processing Units by Using Artificial Neural Networks» was indexed with 7 pages, in the CIVILICA citation database, code COI:TOIL01_018, after evaluation and approval of the referees of the "The 1st National Conference for Technology Development in Oil, Gas & Petrochemical Industries held in Ahvaz 2011.

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.