Sándor, Gáspár, Gábor Vajda, and Ede Martos. “Qualification of the Results of Aggregated Lean KPIs Along Fuzzy Logic”. Multidisciplinary Challenges, Diverse Responses - Journal of Management and Business Administration, no. 2 (December 31, 2021): 2-27. Accessed April 20, 2025. https://ojs3.mtak.hu/index.php/mksv/article/view/6755.