M. Wielechowski, D. Cherevyk, K. Czech, P. Kotyza, Łukasz Grzęda, and L. Smutka, “Interdependence between human capital determinants and economic development: K-means regional clustering approach for Czechia and Poland”, EBER, vol. 9, no. 4, pp. 173–194, Nov. 2021, doi: 10.15678/EBER.2021.090411.