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Abilio Avila and  Orestis Terzidis,  The Analysis of Secondary Case Studies as a Starting Point for Grounded Theory Studies: An Example from the Enterprise Software Industry.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. May 2017, vol. 125(5). 1167 - 1172[viewed 25 September 2017]. Available from: http://waset.org/publications/10007012.