M. Heck and  H. Vettiger,   Production Planning and Scheduling and SME.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2014, vol. 91(7). 2276 - 2288
    [viewed 16 April 2024]. Available from: https://publications.waset.org/pdf/9998879.