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Genesis of Al Qae'da - Al Qa'eda Leadership, Ideology and Organisation - Evolution of Al Qae'da: Peshawar to Khartoum and to Kandahar - Al Qa'eda's International Support and Operational Network - Al Qae'da Doctrine: Strategies, Tactics and Targets - A Watershed Event: September 11, 2001 - The International Response
Brown et al. (Tue,) studied this question.