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This is to certify that your paper entitled «Operational matrix and their applications for solving time-varying delay systems» was indexed with 10 pages, in the CIVILICA citation database, code COI:JR_IJNAA-14-9_005, after evaluation and approval of the referees of the "International Journal of Nonlinear Analysis and Applications Vol 14, Issue 9 , Year 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 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.