1. Robbins, C.R., and Scott, G.V. J. Soc. Cosmet. Chem. 29, 783 (1978).
2. Hough, P., et al. J. Soc. Cosmet. Chem. 27, 571 (1976).
3. Robbins, C.R., and Reich, C. J. Soc. Cosmet. Chem. 37, 141 (1986).
4. International Dictionary of Physics and Electronics,” Van Nostrand Reinhold, New York (1956).
5. Elliot, A. Textile Res. J. 22, 783 (1952).