1. Goldfrank's toxicologic emergencies,2002
2. Carbon dioxide poisoning;Langford;Toxicol Rev,2005
3. Criteria for a recommended standard;Finkles,1976
4. Occupational Safety and Health Administration. Limits for air contaminants, occupational health and safety standards, Standard Number 1910.1000 Table Z-1, Table updated February 28, 2006; Federal Registrar v71(39).