Vojtková, Mária, and Eva Sodomová. “Classification of EU Countries According to Selected Indicators from the Field of Business Demography Using Self-Organising Maps”. Krakow Review of Economics and Management Zeszyty Naukowe Uniwersytetu Ekonomicznego W Krakowie, no. 11(947), May 2016, pp. 37-52, https://doi.org/10.15678/ZNUEK.2015.0947.1103.