Dr Sarah Marsden introduces her paper A Social Movement Theory typology of militant organisations: Contextualising terrorism. Terrorism and Political Violence. [Online first] doi: 10.1080/09546553.2014.954039 http://www.tandfonline.com/eprint/KjVBTCwDCNPeP96RuVzh/full#.VGxb0Ic2I0M

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