1. Ward, M. A. V. “Combustion in an Internal Combustion Engine,” U.S. Patent No. 3,934,566, January 27, (1976).
2. Wortberg, G. “Ion-Concentration Measurements in a Flat Flame at Atmospheric Pressure,” 10th International Symposium on Combustion, The Combustion Institute, Pittsburgh, Pa., p. 651 (1965).
3. Calcote, H. F. “Ion Production and Recombination in Flames,” 8th International Symposium on Combustion, The Combustion Institute, Pittsburgh, Pa. (1962).
4. Calcote, H. F. “Ionization in Hydrocarbon Flames,” 26th Meeting of propulsion and Energetics Panel, AGARD, Pisa, Italy (1965).
5. Bradley, D., Ibrahim, S. M. A., Sheppard, C. G. W. “Self-generated Electrical Fields in Flames,” 14tH International Symposium on Combustion, The Combustion Institute, Pittsburgh, Pa., p. 383 (1973).