Badarch Tuyatsetseg,  Parametric Modeling Approach for Call Holding Times for IP based Public Safety Networks via EM Algorithm.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2013, vol. 73(1). 83 - 90
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/5216.