@article{abreu_campana-filho_2005,  title={Preparation and characterization of carboxymethylchitosan},  volume={15},  ISSN={0104-1428},  url={https://doi.org/10.1590/S0104-14282005000200004},  DOI={10.1590/S0104-14282005000200004},  number={2},  journal={Polímeros},  publisher={Associação Brasileira de Polímeros},  author={Abreu, Fernanda R. de and Campana-Filho, Sérgio P.},  year={2005},  month={Apr},  pages={79–83} }