SIKA, Peter - KOVÁROVÁ MARTIŠKOVÁ, Alžbeta. Sustainability of the Pension System of the Slovak Republic in the Changed Socio-Economic Conditions. - Registrovaný: Scopus. In Journal of Security and Sustainability Issue. - Vilnius : The General Jonas Žemaitis Military Academy of Lithuania. ISSN 2029-7025, September 2016, vol. 6, no. 1, pp. 113-123. ITMS 26240120032, VEGA 1/0002/16.