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 Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2017, vol. 125(5). 1194 - 1199
    [viewed 25 January 2022]. Available from: https://publications.waset.org/pdf/10007012.