Zhizhong Jiang and  Peter Naudé and  Craig Comstock,  An Investigation on the Variation of Software Development Productivity .   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2007, vol. 4(4). 957 - 966
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/12425.