1. P.V. Kokotović, H. Khalil, J. O’Reilly, Singular Perturbation Methods in Control: Analysis and Design (Academic Press, 1986)
2. M. Klein, G.J. Rogers, P. Kundur, A fundamental study of inter-area oscillations in power systems. IEEE Trans. Power Syst. 6, 914–921 (1991)
3. J.H. Chow, G. Peponides, P.V. Kokotović, B. Avramović, J.R. Winkelman, Time-Scale Modeling of Dynamic Networks with Applications to Power Systems (Springer, New York, 1982)
4. J.H. Chow, P.V. Kokotović, Time scale modeling of sparse dynamic networks. IEEE Trans. Autom. Control, AC-30 714–722 (1985)
5. J.H. Chow, R.A. Date, H. Othman, W.W. Price, Coherency aggregation of large power systems. in Application of Eigenanalysis and Frequency Domain Methods for System Dynamic Performance (IEEE Power Engineering Society, 1990)