1. Matson, T.P., and M. Berretz, Soap Cosmet. Chem. Spec. (Nov. 1979).
2. Friberg, S.E., and M. Chiu, J. Dispersion Sci. Tech 9 (5):1988.
3. Book of ASTM Standards, American Society for Testing Materials, Philadelphia, ASTM D 2024.
4. Book of ASTM standards, American Society for Testing Materials, Philadelphia, ASTM D 1173.
5. Draves, C.Z., Am. Dyestuff Rep. 28, 425 (1939).