Uyen, V., and L. Xoan. “Testing Okun’s Law on the Relationship Between Employment Rate and Economic Growth in Developed and Developing Countriesa”. Science & Technology Development Journal: Economics- Law & Management, Vol. 6, no. 2, June 2022, pp. 2809-22, doi:https://doi.org/10.32508/stdjelm.v6i2.865.