1. Universität Karlsruhe: Institute for Industrial Production.
http://www.iip.kit.edu/65.php
. Accessed 18.06.09
2. Karlsson, K., Meibom, P.: Integration of Hydrogen as Energy Carrier in the Nordic Energy System. Risø National Laboratory (2006)
3. Ravn, H.: Balmorel.
http://www.balmorel.com/
. Accessed 22.04.09
4. Ball, M., Wietschel, M., Rentz, O.: Integration of a hydrogen economy into the German energy system: an optimising modelling approach. Int. J. Hydrogen Energy 32(10–11), 1355–1368 (2007)
5. Ea Energy Analyses: 50% Wind Power in Denmark in 2025. Ea Energy Analyses (2007)