@article{song_yunjun_2014,  title={Effect of hyperbranched polyesters on HTPB polyurethane curing kinetic},  volume={17},  ISSN={1516-1439},  url={https://doi.org/10.1590/S1516-14392013005000193},  DOI={10.1590/S1516-14392013005000193},  number={1},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={Song, Xuejing and Yunjun, Luo},  year={2014},  month={Jan},  pages={78–82} }