Vlahinic Lenz, Nela, and Ivana Grgurev. “Assessment of Energy Poverty in New European Union Member States: The Case of Bulgaria, Croatia and Romania”. International Journal of Energy Economics and Policy, vol. 7, no. 2, Apr. 2017, pp. 1-8, https://econjournals.com.tr/index.php/ijeep/article/view/4003.