WASET
    Mahmoud I. Syam,  Investigating the Efficiency of Stratified Double Median Ranked Set Sample for Estimating the Population Mean.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2016, vol. 119(11). 568 - 573
    [viewed 11 May 2024]. Available from: https://publications.waset.org/pdf/10005690.