1. IEA, Key world energy statistics, https://www.iea.org/publications/freepublications/publication/kwes.pdf.
2. Decision Making Algorithms for Hydro-Power Plant Location;Majumder;Springer Briefs in Energy,2013
3. Energy recovery in existing infrastructures with small hydropower plants, http://www.esha.be/.
4. Clean energy saving: applied research into Etna's water supply systems in Catania;Patania;WIT Transactions on Ecology and the Environment,2007
5. Sherpa Project, Strategic study for the development of Small Hydro Power in the European Union, www.erec.org.