8Phythian M. The perfect intelligence failure? U. S. pre-war intelligence on Iraqi weapons of mass destruction. Politics & Policy, 2006,34(2) :400 -424.
9Henderson P G. Intelligence Failure of 9/11. World & 1,2002,17 (12) :257 -270.
10O' Leary J. Surprise and Intelligence. Airpower Journal, 1994,8 (1) :34 -51.