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2) L. M. Jackman and S. Sternhell, “Applications of Nuclear Magnetic Resonance Spectroscopy in Organic Chemistry,” 2nd Ed., Pergamon, Oxford (1969), p. 81;
N. S. Bhacca and D. H. Williams, “Applications of NMR Spectroscopy in Organic Chemistry,” Holden-Day, San Franscisco (1964), pp. 185–190;
T. Goto and K. Tori in “Jikken-Kagaku-Koza,” Supplement 12, Maruzen, Tokyo (1967), pp. 356–360.
3) N. C. Wilson and J. B. Stothers in E. L. Eliel, and N. L. Allinger Ed., “Topics in Stereochemistry,” Vol. 8, John Wiley and Sons, New York (1974), p. 63.