Nermin Sökmen,  Functional Decomposition Based Effort Estimation Model for Software-Intensive Systems.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2014, vol. 93(9). 1628 - 1632
    [viewed 18 April 2024]. Available from: https://publications.waset.org/pdf/9999429.