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This is to certify that your paper entitled «Preparation and characterization of BF3 supported on coconut shell as a green and efficient nanocatalyst for synthesis of 2-amino-4H-chromene-3-carbonitrile derivatives» was indexed with 10 pages, in the CIVILICA citation database, code COI:NEWCONF04_297, after evaluation and approval of the referees of the "The 4th International Conference on New Findings in Agricultural Science,Natural Resources and the Environment held in Tehran 2018.

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.