@article{xia_cheng_xu_cheng_2015,  title={Retinoic acid liposome-hydrogel: preparation, penetration through mouse skin and induction of F9 mouse teratocarcinoma stem cells differentiation},  volume={51},  ISSN={1984-8250},  url={https://doi.org/10.1590/S1984-82502015000300006},  DOI={10.1590/S1984-82502015000300006},  number={3},  journal={Brazilian Journal of Pharmaceutical Sciences},  publisher={Universidade de São Paulo, Faculdade de Ciências Farmacêuticas},  author={Xia, Hongmei and Cheng, Yongfeng and Xu, Yinxiang and Cheng, Zhiqing},  year={2015},  month={Jul},  pages={541–549} }