@article{sousa filho_oliveira_lemos_bezerra_2015,  title={Evaluation of Two Statistical Tools (Least Squares Regression and
               Artificial Neural Network) in the Multivariate Optimization of Solid-Phase Extraction
               for Cadmium Determination in Leachate Samples},  volume={26},  ISSN={0103-5053},  url={https://doi.org/10.5935/0103-5053.20140211},  DOI={10.5935/0103-5053.20140211},  number={1},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Sousa Filho, Hélio R. and Oliveira, Daniel M. and Lemos, Valfredo A. and Bezerra, Marcos A.},  year={2015},  month={Jan},  pages={40–50} }