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This is to certify that your paper entitled «Fabrication and characterization of polysulfone-graphene oxide mixed matrixmembranes for average surface roughness of the membranes and tensilestrength and elongation at break point of the membranes» was indexed with 15 pages, in the CIVILICA citation database, code COI:GASCONF04_008, after evaluation and approval of the referees of the "4th international conference on petroleum engineering, geological gas and petrochemical industries held in Hamadan 2025.

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.