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This is to certify that your paper entitled «Mathematical modelling of a third-party logistics provider supply chain network in global context with demand uncertainty and quantitydiscount» was indexed with 14 pages, in the CIVILICA citation database, code COI:IMIE04_015, after evaluation and approval of the referees of the "The 4th National Conference on Industrial and Industrial Engineering, with emphasis on regional and global paradigms held in Tehran 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.