1. Mansour Y. Voltage stability of power systems: concepts, analytical tools and industry experience, IEEE Power Engineering Subcommittee Report 90TH0358-2-PWR.
2. Estimating the voltage stability of a power system;Kessel;IEEE Transaction on Power Delivery,1986
3. Moghavvemi M. New method for indicating voltage stability condition in power system, In: Proceedings of IEE International Power Engineering Conference, IPEC 97, Singapore, p. 223–227.
4. Voltage collapse proximity indicator: behaviour and implications;Chebbo;IEE Proceedings C,1992
5. Voltage stability analysis using static and dynamic approcaches;Morrison;IEEE Transactions,1993