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This is to certify that your paper entitled «The relationship among changes in microstructure, active sites behavior and properties in the propylene polymerization with a 4th generation Ziegler-Natta catalyst» was indexed with 12 pages, in the CIVILICA citation database, code COI:JR_POJ-6-2_004, after evaluation and approval of the referees of the "Polyolefins Journal Vol 6, Issue 2 , 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.