@article{sekaran_rani_2010,  title={Development and validation of spectrophotometric method for the determination of DPP-4 inhibitor, sitagliptin, in its pharmaceutical preparations},  volume={35},  ISSN={0100-4670},  url={https://doi.org/10.1590/S0100-46702010000300003},  DOI={10.1590/S0100-46702010000300003},  number={3},  journal={Eclética Química},  publisher={Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP},  author={Sekaran, C. Bala and Rani, A. Prameela},  year={2010},  month={Sep},  pages={45–53} }