S. S. Mishra and  D. K. Yadav,  Cost and Profit Analysis of Markovian Queuing System with Two Priority Classes: A Computational Approach.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2009, vol. 33(9). 721 - 727
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9239.