1. Shindo, A., Rep. Gov. Ind. Res. Inst., Osaka, Japan, No. 317, December 1961.
2. Standage, A. E., and Prescott, R., Nature, 211, 169 (1966).
3. Houtz, R. C., Textile Research J., 20, 786 (1950).
4. Total Spectra Chemical Classes Index, Sadtler Research Laboratories Inc., Philadelphia, Pa., USA.