@article{wreszinski_2020,  title={One or two small points in thermodynamics},  volume={42},  ISSN={1806-1117},  url={https://doi.org/10.1590/1806-9126-RBEF-2020-0094},  DOI={10.1590/1806-9126-RBEF-2020-0094},  journal={Revista Brasileira de Ensino de Física},  publisher={Sociedade Brasileira de Física - SBF},  author={Wreszinski, Walter},  year={2020},  pages={e20200094} }