1. This work was supported, at Davis, by the Army Research Office and Electric Power Research Institute and carried out, at LLNL, under the auspices of the Department of Energy, under contract W-7405-ENG-48 with the University of California. Conversations and correspondence with Denis Evans, Jim Dufty, Jim Haile, Tony Ladd, Tom Leete, Bill Moran, and Solveig Shearer were pertinent, stimulating, and helpful.
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