@article{fan_fan_wu_2019,  title={Sulfonated Styrene-Acrylic Acid Copolymers with pH-Indicator Property},  volume={30},  ISSN={0103-5053},  url={https://doi.org/10.21577/0103-5053.20190107},  DOI={10.21577/0103-5053.20190107},  number={9},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Fan, Xin and Fan, Ping and Wu, Yuehuan},  year={2019},  month={Sep},  pages={1941–1946} }