Bolganbayev, A., K. Myrzabekkyzy, S. Baimaganbetov, and D. Kelesbayev. “The Effect of Oil Prices on the Economic Growth of Oil Exporting Countries Bordering the Caspian Sea: Panel Data Analysis”. International Journal of Energy Economics and Policy, vol. 11, no. 6, Nov. 2021, pp. 432-7, https://econjournals.com/index.php/ijeep/article/view/11835.