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Khaled M. Khan and  Armstrong Nhlabatsi,  Identifying Common Behavioural Traits of Lone-Wolves in Recent Terrorist Attacks in Europe.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. July 2017, vol. 127(7). 1816 - 1819[viewed 24 June 2018]. Available from: http://waset.org/publications/10007469.