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Eto, Joseph H, Manu Parashar, Bernard Lesieutre, and Nancy J Lewis. California ISO Real Time Voltage Security Assessment (VSA) Project: Summary of Survey Results on Methodologies for use in Real-Time Voltage Security Assessment (Real-Time Grid Reliability Management PIER Final Project Report Appendix A). Berkeley: LBNL, 2008.PDF
Siddiqui, Afzal S, Chris Marnay, and Mark Khavkin. "Spot Pricing of Electricity and Ancillary Services in a Competitive California Market." Hawaii International Conference on System Sciences 2001: 10.PDF