WASET
    Amirhossein Chambari and  Seyed Habib Rahmaty and  Vahid Hajipour and  Aida Karimi,  A Bi-Objective Model for Location-Allocation Problem within Queuing Framework.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2011, vol. 54(6). 555 - 562
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/14217.