1. Towards a thematic strategy for the security of energy supply. Green Paper, Communication of the European Commission, COM(2000) 769 final, Brussels; 29.11.2000.
2. Papadopoulos A, Georgiadis P. Distributed energy systems: possibilities of operational activity development under the current legislation status. In: Technika Chronika, Scientific Edition, vol. IV, Issue 18, No. 1. 1998. p. 29–41 [in Greek].
3. Papadopoulos A, Koronaios C, Moussiopoulos N. Optimisation of RES systems in islands with geomorphologic and economic restrictions. In: sixth national congress for the renewable energy sources, vol. B; 1999. p. 451–8 [in Greek].
4. Bana e Costa CA, editor. Readings in multiple criteria decision aid. Berlin: Springer; 1990.
5. The outranking approach and the foundations of ELECTRE methods;Roy,1990