1. Wind Turbune Generator Systems?Part 21: Measurement and Assessment of Power Quality Characteristics of Grid Connected Wind Turbines. IEC 61400-21, 2001.
2. Applying power quality characteristics of wind turbines for assessing impact on voltage quality
3. Eltra and Elkraft System. Handling of electricity surplus and deficiency in the Danish power system. Document 104280, 2001; (in Danish).
4. Wind Turbines?Part 25. Communication Standard for Remote Control and Monitoring of Wind Power Plants. IRC 61400-25, 2000.
5. Predicting the output from wind farms?an overview. In Wind Energy for the New Millennium, (eds). WIP Renewable Energies: Munich, 2001; 60-62.