WASET
    Ahmad Thanyan Al-Sultan,  Airport Check-In Optimization by IP and Simulation in Combination.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2015, vol. 97(1). 403 - 406
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10001013.