Presented to

[نام نویسنده را انتخاب نمایید]

This is to certify that your paper entitled «Determining and estimating the effective factors on the export of urea petrochemical product to export destinations (UAE, Turkey, China and India) using auto-regression with distributive lag model (ARDL)» was indexed with 20 pages, in the CIVILICA citation database, code COI:JR_PBR-5-4_002, after evaluation and approval of the referees of the "Petroleum Business Review Vol 5, Issue 4 , Year 2022.

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.