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This is to certify that your paper entitled «The Solvability of Concave-Convex Quasilinear Elliptic Systems Involving $p$-Laplacian and Critical Sobolev Exponent» was indexed with 19 pages, in the CIVILICA citation database, code COI:JR_SCMA-12-1_004, after evaluation and approval of the referees of the "Sahand Communications in Mathematical Analysis Vol 12, Issue 1 , Year 2019.

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 journal 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.