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This is to certify that your paper entitled «Introducing the types of dams and examining the disadvantages and benefits of rubber dams» was indexed with 14 pages, in the CIVILICA citation database, code COI:GERMANCONF03_133, after evaluation and approval of the referees of the "Third International Congress of Science and Engineering 2020.

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.