BAŠOVÁ, Alena. Diversification as a Tool to Increase Energy Security. In Studia commercialia Bratislavensia : Scientific Journal of Faculty of Commerce, University of Economics in Bratislava. - Bratislava : Obchodná fakulta Ekonomickej univerzity v Bratislave, 2018. ISSN 1337-7493, 2018, roč. 11, č. 2, s. 149-164.