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2. Proceedings: Bulk Power System Voltage Phenomena II-Voltage Stability and Security,1991
3. Colloquium on Power System Dynamic Performance;CIGRÉStudy Committee 38,1993
4. Proceedings: Bulk Power System Voltage Phenomena III-Voltage Stability, Security and Control,1994
5. Survey of the Voltage Collapse Phenomenon-Summary of the Interconnection Dynamics Task Force on the Voltage Collapse Phenomenon;NERC (North American Electric Reliability Council),1991