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2. S. I. Bodnar and S. I. Mayeux, Anal. Chem.,30, 1384 (1958).
3. P. A. T. Swoboda, Chem. and Industr.,1960, 1262.
4. M. Rogozinsky, L. M. Shorr, and A. Warshawsky, J. Chromatogr.,8, 429 (1962).
5. Yu. D. Norikov, Zavodsk. laborat.,1, 28 (1961).