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  C. K.  INGOLD  and B.  J. GREGORY.  J. Chem. Soc. B, 276
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  F. CARIATI  and L.  NALDINI.  Gazz. Chim.  Ital.  95,  201
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F. H.  JARDINE,  L. RULE,  and A. G. VOHRA.  J. Chem. Soc.
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