@article{xia_chen_sun_2009,  title={Optimal paths for minimizing lost available work during heat transfer processes with a generalized heat transfer law},  volume={39},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332009000100017},  DOI={10.1590/S0103-97332009000100017},  number={1},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Xia, Shaojun and Chen, Lingen and Sun, Fengrui},  year={2009},  month={Mar},  pages={99–106} }