Hejduková, Pavlína, Lucie Kureková, and Michaela Krechovská. “THE MEASUREMENT OF INDUSTRY 4.0: AN EMPIRICAL CLUSTER ANALYSIS FOR EU COUNTRIES”. International Journal of Economic Sciences 9, no. 1 (June 20, 2020): 121–134. Accessed January 22, 2025. https://ijes-journal.org/journal/article/view/78.