1. C. Kettering, US Patents 1,150,523 and 1,171,055.
2. J. Miller, R. Brost, in: Proceedings of the Advanced Automotive Battery Conference, Las Vegas, NV, USA, February 2001.
3. J. Wallace, in: Proceedings of the Fourth Advanced Lead-Acid Battery Consortium Contractors Conference, Nice, France, March 2000.
4. See Massachusetts Institute of Technology at http://auto.mit.edu/consortium for a summary of the status of 42-V PowerNet.