1. GOST 15150–69 Machines, instruments and other technical products;Versions for different climatic regions. Categories, operating, storage and transportation conditions regarding the impact of environmental climatic factors
2. GOST 16350–70 Climate of the USSR;Zoning and statistical parameters of climatic factors for technical purposes
3. Geomagnetic activity indices;Zabolotnaya;M.: Gidrometeoizdat,2004
4. Results of long-term recordings of currents in the neutrals of power transformers;Selivanov
5. Effects of geomagnetically induced currents in the BC Hydro 500 kV system