S. Barbosa and  M. Pinto and  J. A. Almeida and  E. Carvalho and  C. Diamantino,  Hydrochemical Contamination Profiling and Spatial-Temporal Mapping with the Support of Multivariate and Cluster Statistical Analysis.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2021, vol. 177(9). 243 - 252
    [viewed 19 September 2024]. Available from: https://publications.waset.org/pdf/10012200.