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This is to certify that your paper entitled «Efficient biomass pretreatment using ionic liquids: a review» was indexed with 21 pages, in the CIVILICA citation database, code COI:OGPD01_131, after evaluation and approval of the referees of the "The first international oil, gas and petrochemical conference with sustainable development approach (University relationship with industry) held in Tehran 2015.

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.