1. Analysis of effects of three-phase voltage unbalance on induction motors with emphasis on the angle of the complex voltage unbalance factor;Wang;IEEE Trans. Energy Convers.,2001
2. IEEE Recommended Practice for Monitoring Electric Power Quality, IEEE Standard 1159,2009
3. Elecromagnetic Compatibility (EMC) – Part 4-30: Testing and Measurement Techniques – Power Quality Measurement Methods, IEC 61000-4-30,2008
4. Electricity Supply – Quality of Supply – Part 2: Voltage Characteristics, Compatibility Levels, Limits and Assessment Methods, NRS 048-2,2003
5. Procedimentos de Distribuição de Energia Elétrica no Sistema Elétrico Nacional (in Portuguese), ANEEL – PRODIST,2011