1. A. Hashem, Effects of chronic administration of some addicting drugs on selective neuro chemical transmitters, M.D. thesis in forensic medicine, Faculty of Medicine, Tanta University, Tanta, Egypt (1987).
2. T. Elnimr,Radioisotopes 40(5), 193 (1991).
3. T. Elnimr, N. B. Rofail, and A. M. Hassan,Arabian J. Sci. Eng. 14(3), 447 (1989).
4. T. Elnimr,Trace Elem. Med. 10(3), 148 (1993).
5. A. F. Hermens, R. Korvin, A. M. De Leeuw, and B. Van der Berk,Cancer 53 (suppl), 224 (1986).