1. Zweidler, R. and H. Hefti,Encycl. Chem. Tech. 4: 213 (1978).
2. Theidel, H., and G. Schmitz,J. Chromatogr. 27:413 (1967).
3. Schulze, J., T. Polaro and P. Stensby,Soap/Cosmetics/Chemical Specialties 50:47 (1974).
4. Lloyd, J.B.F., and J. Forens,Sci. Soc. 17:145 (1977).
5. Lepri, L., P.G. Desideri and W. Coas,J. Chromatogr. 322:363 (1985).