1. API RP754 “Process Safety Performance Indicators for the Refining and Petrochemical Industries” American Petroleum Institute Washington D.C. U.S. 2016.
2. CAIB2003 “Columbia Accident Investigation Board Report Volume 1” http://www.nasa.gov/columbia/caib/html/start.html.
3. CCPS Process Safety Glossary;CCPS;Center for Chemical Process Safety