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2.
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3.
AndersonW. R.Jr. and SilversteinR. M., Anal. Chem.37, 1417 (1965).
4.
LeydenD. E. and CoxR. H., Analytical Applications of NMR (Wiley-Interscience, New York, 1977), p. 258.
5.
AOCS Method Tf 2a-64.
6.
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