1. Agency for “Toxic Substances and Disease” Registry Public Health Statement, www.atsdr.cdc.gov/ToxProfiles, 1989.
2. Risk Information Web Server, Toxicity Summary for Cyanide, www.Risk.lsd.ornl.gov/tox/profiles/cyanide.
3. About a synthetic saliva for in vitro studies
4. WHO Oral Health Country/Area Profile Programs, Department of Non-Communicable Diseases Surveillance/Oral Health WHO Collaborating Centre, Malmo University, Sweden.