Suleman, Abdul, Fátima Suleman, and Elizabeth Reis. “Fuzzy Approach to Discrete Data Reduction: An Application in Economics for Assessing the Skill Premium”. Journal of Business Economics and Management 17, no. 3 (June 7, 2016): 414-429. Accessed December 4, 2024. https://jcem.vgtu.lt/index.php/JBEM/article/view/2246.