Šarotar Žižek, Simona, Zlatko Nedelko, Matjaž Mulej, and Živa Veingerl Čič. 2020. “Key Performance Indicators and Industry 4.0 – A Socially Responsible Perspective”. Naše Gospodarstvo Our Economy 66 (3): 22-35. https://old.journals.um.si/index.php/oe/article/view/2124.