1. Abdel-Aal, Y. A. I., and M. R. Riskallah: Leptophos resistance and esterase activity inSpodoptera littoralis (Boisd.). Proc. 4th Conf. Pest Control National Research Center, Cairo (1978).
2. Abou-Donia, M. B., M. A. Othman, A. Z. Khalil, G. Tantawy, and M. F. Shawer: Neurotoxic effect of leptophos. Experientia30, 63 (1974).
3. Abou-Donia, M. B., and S. H. Preissig: Delayed neurotoxicity of leptophos, toxic effects on the nervous system of hens. Toxicol. Appl. Pharmacol.35, 169 (1976).
4. Ben-Aziz, A., J. Meisner, N. Aharonson, and K. R. S. Ascher: Excretion of unchanged organophosphorus compounds after their comsumption by larvae of the Egyptian cotton leaf-worm,Spodoptera littoralis (Boisd.). Pestic. Biochem. Physiol.6, 58 (1976).
5. Bowman, M. C., and M. Beroza: Determination of insecticideO-(4-bromo-2,5-dichlorophenyl)O-methyl phenylphosphonothioate, Velsicol VCS-506, its oxygen analog, and its phenolic hydrolysis product in corn and milk. J. Agr. Food Chem.6, 609 (1969).