HUDÁK, Matej. Sustainability of Digital Public Spaces. - Registrovaný: Scopus, Registrovaný: Web of Science. In Quality Innovation Prosperity. - Košice : Technická univerzita v Košiciach. ISSN 1335-1745, 2015, vol. 19, no. 1, pp. 103-111 online. INTERREG IVC's project 1038R4 Digital Cooperatives (E-COOP).