Enkhbayar Jamsranjav, and Ishjantsan Gursuren. “MACRO-ECONOMIC IMPORTANCE OF COAL INDUSTRIES IN AUSTRALIA, CHINA AND MONGOLIA; THE EXAMINATION OF THE GREGORY EFFECT IN THE THREE COUNTRIES”. Journal of Business and Innovation, vol. 3, no. 3, Feb. 2023, pp. 16-26, https://journal.num.edu.mn/BusinessAndInnovation/article/view/2158.