3Peter B Ladkin,Loer K. Why-because Analysis: Formal Reasoning about Incidents[ R]. Bielefeld University, 1998.
4Zahid H Qureshi. A Review of Accident Modelling Approaches for Complex Critical Sociotechnical Systems [R] . Univer- sity of South Australia ,2008.
5Peter B Ladkin. A Quick Introduction to Why-Because Analysis[R] . Bielefeld University, 1999.
6Peter B Ladkin. The Report of the Accident to Airbus A320 -211 Aircraft in Warsaw on 14 September 1993[R]. Main Commission of Aircraft Investigation Warsaw, 1994.