1. Deutsche Energie Agentur (dena), Berlin: ‘Integration into the national grid of onshore and offshore wind energy generated in Germany by the year 2020', available at: http://www.offshore-wind.de/media/article004593/dena-Netzstudie,%20Haupttext,%20r.pdf
2. Union for the Co-ordination of Transmission of Electricity (UCTE): ‘Operation handbook policy 1: load–frequency control and performance', available at: http://www.ucte.org/_library/ohb/policy1_v22.pdf
3. Luther, M., Radtke, U., and Winter, W.R.: ‘Wind power in the German power system: current status and future challenges of maintaining quality of supply’, Ackermann, T., Wind Power in Power Systems, 1st(John Wiley & Sons Ltd 2005), p. 233–255
4. Quantifying the Total Net Benefits of Grid Integrated Wind