@article{pereira_neiverth_maeda_guiotoku_franciscon_2011,  title={Complexometric titration with potenciometric indicator to determination of calcium and magnesium in soil extracts¹},  volume={35},  ISSN={0100-0683},  url={https://doi.org/10.1590/S0100-06832011000400027},  DOI={10.1590/S0100-06832011000400027},  number={4},  journal={Revista Brasileira de Ciência do Solo},  publisher={Sociedade Brasileira de Ciência do Solo},  author={Pereira, Claudia Mara and Neiverth, Cristhiane Anete and Maeda, Shizuo and Guiotoku, Marcela and Franciscon, Luziane},  year={2011},  month={Jul},  pages={1331–1336} }