1. D’Angel, E., Perrella, G., Bianco, R., Energy Efficiency Indicators of Italy, ENEA Centra Ricecche Casaccia, Roma, RT/ERG/96/3, 1996.
2. Angelini, A.M., Actual and Prospective Sources of Electrical Energy, Private Commmunication, 1996.
3. Angelini, A.M., A Note on the Role of System Engineering in the Industry of a Changing Society, Technology in Society, Vol. 15, No. 4, pp. 461–466, 1996.
4. Sarkor, A.U., Roragos, S., Sustainable Development of Hydroelectric Energy, Energy, Vol. 20, No. 10, pp. 977–981, 1995.
5. Cafier, G., Conte, G., Rome as a Sustainable City, Agency for a Sustainable Mediterranean Development, 1995.