Joval P George and  Dr. Zheng Chen and  Philip Shaw,  Fault Detection of Drinking Water Treatment Process Using PCA and Hotelling's T2 Chart.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2009, vol. 26(2). 430 - 435
    [viewed 18 October 2019]. Available from: https://publications.waset.org/pdf/9487.