WASET
    Guilan Huang,  Spatially Random Sampling for Retail Food Risk Factors Study.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2016, vol. 114(6). 325 - 329
    [viewed 04 May 2024]. Available from: https://publications.waset.org/pdf/10004778.