Bull Environ Contam Toxicol 1979;22(4-5):586; Cell Tissue Res 1979;203(1):25; Gen Comp Endocrinol 36(3):433;1978; Gen Comp Endocrinol 37(2):156;1979; J Agric Food Chem 25(3):478;1977; Nature 265(5594):548;1977; Trans R Soc Trop Med Hyg 72(6):666;1978