Om Parkash and  C.P.Gandhi,  Variation of Uncertainty in Steady And Non-Steady Processes Of Queuing Theory.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2011, vol. 51(3). 399 - 402
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/6395.