1. R. D. Guthrie, “The Carbohydrates,” 2nd Edition, W. Pigman and D. Horton, Ed., Academic Press, New York, 1972, p. 423.
2. H. O. House, “Modern Synthetic Reactions,” 2nd Edition, W. A. Benjamin, Inc., California, 1972, p. 54.
3. J. D. Morrison and H. S. Mosher, “Asymmetric Organic Reactions,” Prentice-Hall, Inc., Newsjersey, 1971, p. 121.