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3. Kleiman, R., M. H. Rawls, and F. R. Earle, Ibid. 7:494 (1972).
4. Lehtinen, T., E. Elomaa, and J. Alhojärvi, Suom. Kemistilehti B36:154 (1963).
5. Hansen, R. P., N. Z. J. Sci. 9:801 (1966).