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2. Discussion on some voltage collapse indices
3. Canizares, C., and Hranilovic, S.: ‘Transcritical and Hopf bifurcations in AC/DC systems’, Fink, L.H., Proc. bulk power system voltage phenomena III – voltage stability and security, (ECC Inc., Davos, Switzerland 1994)
4. Computing small-signal stability boundaries for large-scale power systems