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This is to certify that your paper entitled «Genetic algorithm optimization of two natural gas liquefaction methods based on energy, exergy, and economy analyses: the case study of Shahid Rajaee power plant peak-shaving system» was indexed with 18 pages, in the CIVILICA citation database, code COI:JR_GPJU-9-1_006, after evaluation and approval of the referees of the "Gas Processing Vol 9, Issue 1 , Year 2021.

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.