Mohammad Reza Oftadeh,  Project Objective Structure Model: An Integrated, Systematic and Balanced Approach in Order to Achieve Project Objectives.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2019, vol. 152(8). 1090 - 1094
    [viewed 15 November 2019]. Available from: https://publications.waset.org/pdf/10010654.