@article{madureira_vasconcellos_luzzi_1998,  title={Flux Operators of Microdynamical Quantities in a Nonequilibrium Statistical Ensemble Formalism},  volume={28},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97331998000200006},  DOI={10.1590/S0103-97331998000200006},  number={2},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Madureira, Justino R. and Vasconcellos, Áurea R. and Luzzi, Roberto},  year={1998},  month={Jun},  pages={122–131} }