I. F. Damasceno, V. L. Leal, R. C. Coelho, C. V. R. de Moura, and E. M. de Moura, “Evaluation of pollution level caused by domestic effluent in the Poty river – Teresina PI - Brazil”, Eclet. Quim., vol. 37, no. 1, pp. 51–60, Jun. 2014.