R. Sahraian and  A. Karampour Haghighi and  E. Ghasemi,  A Multi-Objective Optimization Model to the
Integrating Flexible Process Planning And
Scheduling Based on Modified Particle Swarm
Optimization Algorithm (MPSO).   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2011, vol. 55(7). 1535 - 1542
    [viewed 20 January 2021]. Available from: https://publications.waset.org/pdf/12745.