1. ARMOUR, J.: J. Assoc. Offic. Anal. Chem.56, 987 (1973).
2. FOOD AND DRUG ADMINISTRATION: Fed. Regist.38, 18096 (July 6, 1973).
3. KURATSUNE, M., et al.: National Conference on Polychlorinated Biphenyls (Chicago, I11., November 19–21, 1975); proceedings published as EPA 560/6-75-004, pp. 14–29 (March 1976).
4. FOOD AND DRUG ADMINISTRATION: Pesticide Analytical Manual, Vol. I, Section 211.14d (4/1/71 revision).
5. TANNER, J., And M.H. FRIEDMAN: International Conference on Modern Trends in Activation Analysis, Munich, Germany, September 13–17, 1976, proceedings, pp. 344–351.