4. Bendz, E. (2010). Electromagnetic Interference from Wind Turbines on Onsala Space Observatory. Available at http://www.craf.eu/windturb/Electromagnetic%20Interference%20from%20Wind%20Turbines%20on%20Onsala%20Space_1.pptx.
5. Bolli, P. (2010). Measurements of Primary Radiation at a Wind Farm Close to the Sardinia Radio Telescope. Available at http://www.craf.eu/windturb/Bolli.ppt.
6. Grypstra, K. (2010). Secondary RF-Emissions from Wind Energy Parks, http://www.craf.eu/windturb/Secondary%20RF-Emissions%20from%20Wind%20Energy%20Parks%20100427.ppt.
7. Recommendation ITU-R RA.769-2. (2003). Protection Criteria Used for Radio Astronomical Measurement. Available at http://www.itu.int/rec/R-REC-RA.769-2-200305-I.
8. Recommendation ITU-R SA.509-1. (2013). Space Research Earth Station and Radio Astronomy Reference Antenna Radiation Pattern for Use in Interference Calculations. Available at https://www.itu.int/rec/R-REC-SA.509-3-201312-I/en.