1. Stalling, D. L., Proc. Second Intern. Cong. Pesticide Chem., Tel Aviv (1971).
2. US Tariff Commission Plasticisers Rep. (1971).
3. Nematollahi, J., Guess, W. L., and Autian, J., J. Pharm., 56, 1446 (1967).
4. Farm Chemicals (Meister, Willoughby, Ohio, 1971).
5. Standard Methods for the Examination of Water and Wastewater (Amer. Public Health Assoc., New York, 1971).