1. [1] Fuchs, E. F., Masoum, M.A.S. - Power Quality in Power Systems and Electrical Machines, Elsevier Academic Press, Amsterdam, 2008.
2. [2] Andrei, H., Cepisca, C., Grigorescu, S.D., Power Quality and Electrical Arc Furnaces, pp. 55-100, chapter 2 of the book Power Quality, InTech, Wien, 2011.
3. [3] Baggini, A., Handbook of power quality, John Wiley & Sons, Ltd, England, 2008
4. [4] Tugulea, A., Consideratii referitoare la definirea factorului de putere pentru sisteme trifazate dezechilibrate, Energetica , Nr. 4, 1986;
5. [5] Maier, V., Pavel, S., Gh., Beleiu, H., Gh., Lese, D., Characteristics of voltage maintaining methods for electrical networks, Buletin AGIR, 2012.