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2. L. Rohrschneider, ibidem, Vol. 4, New York 1967, p. 346, 348.
3. G. Schomburg, ibidem, Vol. 6, New York 1968, p. 213.
4. S. R. Lowry, H. B. Woodruff, T. L. Isenhour, J. Chromatogr. Sci.14, 129 (1976).
5. W. L. Zielinsky, D. E. Martire, Anal. Chem.48, 1111 (1976).