C.A. Balaras, A.G. Gaglia, E. Georgopoulou, S. Mirasgedis, Y. Sarafidis, D.P. Lalas: European Residential Buildings and Empirical Assessment of the Hellenic Building Stock, Energy Consumption, Emissions & Potential Energy Savings, Building & Environment Vol 42(3) p.1298-1314 Doi: 10.1016/j.buildenv.2005.11.001, 2007