1. A. M. Thayer, Chem. Eng. News, Jan. 30, 1989.
2. R. D. Swisher, “Surfactant Biodegradation,” Marcel Dekker, Inc., New York, Basel, 1987.
3. OECD, “Guidelines for Testing Materials, Section Degradation and Accumulation” 1981, #301A-E, 302A, B, C, 303A, 304A.
4. ASTM Standards D5909, D5910.
5. N. Scholz, Tenside Surfact. Det., 18, 277–281 (1991).