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This is to certify that your paper entitled «Frequency analysis of orthotropic Kelvin-Voigt viscoelastic circular and elliptical nanoplates using boundary characteristic orthogonal polynomials and Rayleigh-Ritz method» was indexed with 2 pages, in the CIVILICA citation database, code COI:WMECH03_048, after evaluation and approval of the referees of the "The Bi-Annual International Conference on Experimental Solid Mechanics (X-Mech-2016) held in Tehran 2016.

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.