@article{paranhos_oliveira_soares_pessan_2007,  title={Poly(vinyl alcohol)/sulfonated polyester hydrogels produced by freezing and thawing technique: preparation and characterization},  volume={10},  ISSN={1516-1439},  url={https://doi.org/10.1590/S1516-14392007000100010},  DOI={10.1590/S1516-14392007000100010},  number={1},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={Paranhos, Caio Marcio and Oliveira, Renata Nunes and Soares, Bluma Guenther and Pessan, Luiz Antônio},  year={2007},  month={Jan},  pages={43–46} }