@article{khan_gorla_2012,  title={Second law analysis for free convection in non-newtonian fluids over a horizontal plate embedded in a porous medium: (prescribed heat flux)},  volume={29},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66322012000300008},  DOI={10.1590/S0104-66322012000300008},  number={3},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Khan, W. A. and Gorla, R. S. R.},  year={2012},  month={Jul},  pages={511–518} }