1. Petrobras Web site (http://www.petrobras.com.br/ingles/pop/padrao/p13_17htm), on April 2000.
2. http://www.BBC on March 21, 2001.
3. Guidelines for Hazard Evaluation Procedures, 2nd Edition, American Institute of Chemical Engineers, Center for Chemical Process Safety, New York, NY, pp 51–72, 1992.
4. Director of Petroflex-Cabo Unit, personal interview, January 2001.
5. “Gerenciamento dos Riscos de Incěndios Uma Nova Maneira de Pensar,” Master's Thesis, Universidade Federal de Pernambuco, Brazil, October 2000.