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This is to certify that your paper entitled «Effects of artazine on the Periphyton Community in Artificial Streams:An Experimental Evaluation on Gamasiab River» was indexed with 15 pages, in the CIVILICA citation database, code COI:WRKC01_020, after evaluation and approval of the referees of the "Water Resources of Kermanshah Conference held in Kermanshah 2007.

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.