@article{lopes júnior_luz_damos_santos_franco_santos_2012,  title={Determination of sildenafil citrate (Viagra®) in various pharmaceutical formulations by flow injection analysis with multiple pulse amperometric detection},  volume={23},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532012005000047},  DOI={10.1590/S0103-50532012005000047},  number={10},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Lopes Júnior, Antônio Carlos V. and Luz, Rita de Cássia Silva and Damos, Flávio S. and Santos, Alexandre S. dos and Franco, Diego L. and Santos, Wallans T. Pio dos},  year={2012},  month={Oct},  pages={1800–1806} }