@article{niazi_2006,  title={Spectrophotometric simultaneous determination of uranium and thorium using partial least squares regression and orthogonal signal correction},  volume={17},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532006000500029},  DOI={10.1590/S0103-50532006000500029},  number={5},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Niazi, Ali},  year={2006},  month={Sep},  pages={1020–1026} }