@article{roque_rama_sousa_pina_2013,  title={Development and stability assessment of liquid paediatric formulations containing sildenafil citrate},  volume={49},  ISSN={1984-8250},  url={https://doi.org/10.1590/S1984-82502013000200021},  DOI={10.1590/S1984-82502013000200021},  number={2},  journal={Brazilian Journal of Pharmaceutical Sciences},  publisher={Universidade de São Paulo, Faculdade de Ciências Farmacêuticas},  author={Roque, Fátima and Rama, Ana Cristina and Sousa, João José and Pina, Maria Eugénia},  year={2013},  month={Apr},  pages={381–388} }