Lima, N. S., Silva, D. F. da, Nunes Neto, W. R., Silva, D. M. da, Sousa, L. C. A. de e Silva, M. R. C. (2020) “Evaluation of the quality of superficial sediment using principal components analysis of the physical–chemical attributes of the Mearim River – Brazil”, Ciência e Natura, 42, p. e5. doi: 10.5902/2179460X41267.