1. Mervyn, L., and Smith, E. L., Prog. Indust. Microbiol., 5, 151 (1964).
2. Ansbacher, S., and Hill, H. H., Abstr. 116th Meet. Amer. Chem. Soc., 31A (1949).
3. Miller, I. M., US Patent 2,960,446 (1960).
4. McDaniel, L. E., US Patent 3,000,793 (1961).
5. Stern, R. M., US Patent 2,923,666 (1960).