1. Power Systems Voltage Stability;Abe;IEEE Trans. on Power Appparatus and Systems,1982
2. Determination of Power System Voltage Stability, Parts I and II;Abe;IEEE of Japan,1976
3. Borremans, P., 'and colleagues' (1984). Voltage Stability: Fundamental Concepts and Comparison of Practical Criteria. International Conference on Large High Voltage Electric Systems, CIGRE 38-11.
4. Carpentier, J., R. Girard, E. Scano (1984). Voltage Collapse Proximity Indicators Computed from an Optimal Power Flow, Proceedings of 8th PSCC, Helsinki.
5. CIGRE' Work Group 38.01, Task Force 03 (1987). Planning Against Voltage Collapse. Electra Magazine, pp. 55-75.