A. Emadi, A. Khaligh, C. H. Rivetta and G. A. Williamson, “Constant Power Loads and Negative Impedance Instability in Automotive Systems: Definition, Modeling, Stability, and Control of Power Electronic Converters and Motor Drives,” Vehicular Technology, IEEE Transactions on, Vol. 55, pp. 1112-1125, 2006.
 Z. Yao, P. G. Therond and B. Davat, “Stability Analysis of Power Systems by the Generalized Nyquist Criterion,” in Control, 1994.Control '94. International Conference on, 1994, pp. 739-744, Vol. 1.
 X. Sun, Y.-S. Lee and D. H. Xu, “Modeling, Analysis, and Implementation of Parallel Multi-Inverter Systems with Instantaneous Average-Current-Sharing Scheme,” Power Electronics, IEEE Transactions on, Vol. 18, No. 3, 2003, pp. 844-856. doi:10.1109/TPEL.2003.810867