1. Voltage stability of radial power links;Weedy;Proc. Inst. Electr. Eng.,1968
2. Estimation of electrical power system steady-state stability in load flow calculation;Venikov;IEEE Trans.,1975
3. Voltage collapse at load ends of power systems;Nagao;Electr. Eng. in Jpn.,1975
4. Determination of power system voltage stability;Abe,1976
5. System reactive power limitations;Lachs,1979