“Production Functions in Identifying the Specifics of Producing Gross Regional Product of Russian Federation”, Mediterr. J. Soc. Sci., vol. 6, no. 5 S3, p. 265, Sep. 2015, Accessed: Apr. 28, 2024. [Online]. Available: https://www.richtmann.org/journal/index.php/mjss/article/view/7772