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2. ASTM Annual Book of Standards, Parts 23?25 (1974).
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4. A. Lewis and H. Strawson, Conf. Light and Static Elec., Culham Lab., 1975 Proc., London, S.A., pp. 181?188.
5. J. H. Warren, R. F. Lange, et al., Hydrocarbon Proc.,53, No. 12, 111?126 (1974).