Choi, Young-Chool. “Analyzing the Relationships Between Business Conditions and Happiness in OECD Countries: Application of the FsQCA Method”. International Journal of Engineering and Technology 8, no. 1.4 (January 2, 2019): 238–248. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/25233.