1. Dobrusin LN. Quality of electrical energy quality and energy saving in Russia. Energoexpert. 2008;4(9):30-35.
2. Naumov АА. Some aspects of energy saving in lighting technology. Bulletin of the Higher Educational Institutions. Problemy Energetiki. 2017;5-6:109-118.
3. Voltage characteristics of electricity supplied by public electricity networks; German version EN 50160:2010/A1:2015, 7 p. Available at: URL https://www.en-standard.eu/din-en-50160-a3-merkmale-der-spannung-in-offentlichen-elektrizitatsversorgungsnetzen-deutsche-und-englische-fassung-en-50160-2010-pra3-2017/ Accessed to:20.12.2018.
4. IEC 61000-2-2: Electromagnetic Compatibility (EMC); Pt 2-2: Environment – Compatibility levels for low-frequency conducted disturbances and signaling in public low-voltage power supply systems. 2000. 29p. Available at: URL https://webstore.iec.ch/publication/4229 Accessed to: 20.12.2018.
5. Naumov АА, Zhukov VG, Kubarev YuG, et al. Certification and periodical tests by the new GOST of electric energy quality. Bulletin of the Higher Educational Institutions. Problemy Energetiki. 2012;3-4:6-8.