1. Koritala, S., and C. R. Scholfield, JAOCS47, 000–000 (1970).
2. Koritala, S., R. O. Rutterfield and H. J. Dutton, Ibid.47, 000–000 (1970).
3. Harlow, R. D., C. Litchfield and R. Reiser, Ibid.40, 505–506 (1963).
4. Emken, E. A., C. R. Schofield and H. J. Dutton, Anal. Chem.41, 388–390 (1964).
5. Tolberg, W. E., and D. H. Wheeler, JAOCS35, 385–388 (1958).