1. www.wind-energy-the-facts.org.
2. IEC 61039. Classification of insulating liquids.
3. Ready biodegradation of MIDEL transformer fluids. Cantest 2007 M&I archive document.
4. Classification of insulating liquids;IEC 61039,2008
5. Transformers for offshore multi-megawatt turbines: discussions on specifications, safety and environment – European Offshore Wind 2007.