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This is to certify that your paper entitled «Effect of Ring-Stiffened Opening on the Ultimate Strength of Corrugated Steel Sandwich Panel» was indexed with 6 pages, in the CIVILICA citation database, code COI:ISME31_088, after evaluation and approval of the referees of the "The 31st annual conference between Iran Mechanical Engineering and the 9th Iran Power Plant Industry Conference held in Tehran 2023.

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.