@article{şanli_şanli_alsancak_2009,  title={Determination of protonation constants of some tetracycline antibiotics by potentiometry and lc methods in water and acetonitrile-water binary mixtures},  volume={20},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532009000500020},  DOI={10.1590/S0103-50532009000500020},  number={5},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Şanli, Senem and Şanli, Nurullah and Alsancak, Güleren},  year={2009},  pages={939–946} }