M. . Niewiadomski, A. Niemczyk, Z. Gródek-Szostak, and J. Strojny, “The path to Industry 4.0: The evolution of industry in the national economies of the European Union in 2009-2020”, IER, vol. 9, no. 3, pp. 75–89, Sep. 2023, doi: 10.15678/IER.2023.0903.05.