Ahmed Mateen and  Zhu Qingsheng and  Faisal Shahzad,  Requirement Engineering and Software Product Line Scoping Paradigm.   journal   = {International Journal of Information and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2018, vol. 138(6). 383 - 388
    [viewed 08 May 2024]. Available from: https://publications.waset.org/pdf/10009067.