Wahyudin P. Syam and  Ibrahim M. Al-Harkan,  Comparison of Three Meta Heuristics to Optimize Hybrid Flow Shop Scheduling Problem with Parallel Machines.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2010, vol. 38(2). 267 - 274
    [viewed 12 August 2020]. Available from: https://publications.waset.org/pdf/699.