@article{kelen_sanli_2009,  title={Determination of pKa values of some auxins in methanol-water mixtures by reversed phase liquid chromatography and potentiometric methods},  volume={20},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532009000100021},  DOI={10.1590/S0103-50532009000100021},  number={1},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Kelen, Mustafa and Sanli, Nurullah},  year={2009},  pages={133–140} }