1. Operant behavior of rats exposed to lead before or after weaning;Angell;Toxicol Appl Pharmacol,1982
2. ATSDR. The nature and extend of lead poisoning in children in the United States: A report to congress. Agency for Toxic Substances and Disease Registry. U.S. Public Health Service, Atlanta, GA; 1988.
3. ATSDR. Toxicological profile for lead. Agency for Toxic Substances and Disease Registry. U.S. Public Health Service, Atlanta, GA; 1999.
4. ATSDR. Top 20 hazardous substances from the 2003 CERCLA Priority List of hazardous substances. http://www.atsdr.ced.gov/cscs3.html (accessed 31 May 2004), 2004.
5. Laughing gull chicks: recognition of their parents’ voices;Beer;Science,1969