Nitin Gupta and  Rakesh Kumar Bajaj,  Stochastic Comparisons of Heterogeneous Samples with Homogeneous Exponential Samples.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2012, vol. 68(8). 848 - 850
    [viewed 27 October 2021]. Available from: https://publications.waset.org/pdf/8260.