@article{elsayed_2020,  title={Controlled release alginate-chitosan microspheres of tolmetin sodium prepared by internal gelation technique and characterized by response surface modeling},  volume={56},  ISSN={1984-8250},  url={https://doi.org/10.1590/s2175-97902020000118414},  DOI={10.1590/s2175-97902020000118414},  journal={Brazilian Journal of Pharmaceutical Sciences},  publisher={Universidade de São Paulo, Faculdade de Ciências Farmacêuticas},  author={Elsayed, Mahmoud M. A.},  year={2020},  pages={e18414} }