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.