HAJDUOVÁ, Zuzana et al. Digital Competences of Polish and Slovak Students—Comparative Analysis in the Light of Empirical Research. - Registrovaný: Scopus. In Sustainability : [International Journal of Environmental, Cultural, Economic and Social Sustainability]. - Basel : MDPI. ISSN 2071-1050, 2020, vol. 12, no. 18, pp. [1-11] online. (2020 - Current Contents). KEGA 026EU4/2018, KEGA 032EU-4/2020, VEGA 1/0240/20.