Hat tip to WoTR for this article and here is a key sentence:Link:http://warontherocks.com/2016/06/don...-decapitation/The best way to defeat ISIL in the long term is to leave Abu Bakr in place – as the caliph who lost his kingdom.
One reference looks interesting, 'Attacking the Leader, Missing the Mark: Why Terrorist Groups Survive Decapitation Strikes' and I think was missed here:http://belfercenter.hks.harvard.edu/publication/24270/attacking_the_leader_missing_the_mark.html?
It is 32pg PDF and is free.
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