V. Terzija, G. Valverde, D. Cai, P. Regulski, V. Madani, J. Fitch, S. Skok, M. Begovic, and A. Phadke, “Wide-area monitoring, protection, and control of future electric power networks,” Proceedings of the IEEE, vol. 99, no. 1, pp. 80-93, 2011.
 A. Chakrabortty and P. P. Khargonekar, “Introduction to wide-area control of power systems,” in American Control Conference, Washington, DC, USA, Jun. 2013, pp. 6758-6770. [OpenAIRE]
 D. Novosel, V. Madani, B. Bhargava, K. Vu, and J. Cole, “Dawn of the grid synchronization,” IEEE Power and Energy Magazine, vol. 6, no. 1, pp. 49-60, 2008.
 I. Dobson, “Observations on the geometry of saddle node bifurcation and voltage collapse in electrical power systems,” IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, vol. 39, no. 3, pp. 240-243, 1992.
 C. A. Can˜izares, “On bifurcations, voltage collapse and load modeling,” IEEE Transactions on Power Systems, vol. 10, no. 1, pp. 512-522, 1995.
 T. Van Cutsem and C. Vournas, Voltage Stability of Electric Power Systems. Springer, 1998.
 C. A. Can˜izares, Ed., Voltage Stability Assessment: Concepts, Practices and Tools. IEEE-PES Power System Stability Subcommittee, Aug. 2002, Tech. Rep. PES-TR9.
 M. Glavic and T. Van Cutsem, “A short survey of methods for voltage instability detection,” in IEEE Power & Energy Society General Meeting, San Diego, CA, USA, 2011, pp. 1-8.
 B. Milosevic and M. Begovic, “Voltage-stability protection and control using a wide-area network of phasor measurements,” IEEE Transactions on Power Systems, vol. 18, no. 1, pp. 121-127, 2003. [OpenAIRE]
 M. Glavic and T. Van Cutsem, “Wide-area detection of voltage instability from synchronized phasor measurements. Part I: Principle,” IEEE Transactions on Power Systems, vol. 24, no. 3, pp. 1408-1416, 2009.
 --, “Wide-area detection of voltage instability from synchronized phasor measurements. Part II: Simulation results,” IEEE Transactions on Power Systems, vol. 24, no. 3, pp. 1417-1425, 2009.
 V. Balamourougan, T. S. Sidhu, and M. S. Sachdev, “Technique for online prediction of voltage collapse,” IEE Generation, Transmission and Distribution, vol. 151, no. 4, pp. 453-460, 2004. [OpenAIRE]
 Y. Gong, N. Schulz, and A. Guzman, “Synchrophasor-based real-time voltage stability index,” in Power Systems Conference and Exposition, Oct. 2006, pp. 1029-1036.
 S. Corsi and G. N. Taranto, “A real-time voltage instability identification algorithm based on local phasor measurements,” IEEE Transactions on Power Systems, vol. 23, no. 3, pp. 1271-1279, 2008. [OpenAIRE]
 Y. Su and X. Wang, “A method for voltage stability assessment based on wide area measurement system,” in Power and Energy Engineering Conference, 2009. APPEEC 2009. Asia-Pacific, Mar. 2009, pp. 1-4.