1. Tie-line power and frequency control of electric power systems;Concordia;Trans Am Inst Electr Eng Part III: Power Appar Syst,1953
2. Definition and classification of power system stability;Kundur;IEEE Trans Pow Sys,2004
3. Power system stability and control,2012
4. ENTSO-E, Continental Europe Operation Handbook, European Network for Transmission System Operators for Electricity, online at .
5. Power system stability and control;Kundur,1994