Retrieved 23 June 2016. Renewable energy systems — 9th edition 2015 (in German). Retrieved 23 June 2016. Konstantin, Panos (2009).
Praxisbuch Energiewirtschaft: Energieumwandlung, -transport und -beschaffung im liberalisierten Markt Praxisbuch energy economy: energy conversion, transport and procurement in the liberalized market (in German). Heidelberg, Germany: Springer-Verlag. Sehr empfehlenswert. Retrieved 23 June 2016.External links Wikimedia Commons has media related to.
in the catalogue.