Panpan Xu and  Qiying Zhang and  Hui Qian,  Irrigation Water Quality Evaluation Based on Multivariate Statistical Analysis: A Case Study of Jiaokou Irrigation District.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2020, vol. 168(12). 384 - 388
    [viewed 07 March 2021]. Available from: https://publications.waset.org/pdf/10011683.