Koopaei, H. R., R. Eildarabadi, and M. Z. Bagheri. “Improved Energy Conversion Process With Coupling Induction Motors And Invastigate Unbalanced Operation With Definition Of The Voltage Unbalance”. Ciência E Natura, vol. 37, Dec. 2015, pp. 307-11, doi:10.5902/2179460X20787.