1. IEC 60071-2, Edition 4.0, 2018-03, Insulation co-ordination - Part 2: Application guidelines
2. IEC 60099-4, Edition 3.0, 2014-06, Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems
3. IEC 60099-5, Edition 3.0, 2018-01, Surge arresters - Part 5: Selection and application recommendations
4. IEC 60071-1, Edition 8.1, 2011-03, Insulation co-ordination - Part 1: Definitions, principles and rules
5. Stenström, L., Taylor, J., Westerlund, H.: An optimal surge arrester for EHV air insulated stations utilizing high-gradient MO resistors. In: IEEE Electrical Insulation Conference (EIC), Ottawa (2013)