Kakimoto N, Nakanishi A, Tomiyama K. Instability of oscillation mode by autoparametric resonance[J]. IEEE Transactions on Power Systems, 2004, 19(4), 1961-1970.
Huang N E, Shen Z, Long S R, et al. The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis[C]. Proceedings of the Royal Society, London, 1998: 903-995.
Zhu S, Vuttal V, Kliemann W. Analyzing dynamic performance of power systerms over parameter space using normal forms of vector fields part-2; comparison of the system structure[J]. IEEE Transaction on Power Systems, 2001, 16(3): 451-455.