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This is to certify that your paper entitled «A copper price prediction model using weighted least squares regression» was indexed with 15 pages, in the CIVILICA citation database, code COI:CARSE04_085, after evaluation and approval of the referees of the "4rd international conference on applied research in science and engineering 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 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.