1. Cupples, H. L., Ind. Eng. Chem.,27, 1219–1222 (1935).
2. Dimroth, O., and Bamberger, C., Ann.,438, 67–114 (1924); Wheland, G. W., “Advanced Organic Chemistry,” John Wiley and Sons, New York, N.Y., 1949, pp. 63–67.
3. Harkins, W. D., and Jordan, H. F., J. Am. Chem. Soc.,52, 1751–1772 (1930).
4. Hunter, B. A., Iowa State Coll. J. Sci.,15, 223–230 (1941).
5. Lefort, D., Oléagineux,12, 685–690 (1957).