Tunjo Perić and  Franjo Bratić,  Production Plan and Technological Variants Optimization by Goal Programming Methods.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2015, vol. 102(6). 1952 - 1958
    [viewed 22 October 2021]. Available from: https://publications.waset.org/pdf/10001765.