@article{hamadou-ibrahim_plastino_plastino_2009,  title={q-entropies and the entanglement dynamics of two-qubits interacting with an environment},  volume={39},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332009000400010},  DOI={10.1590/S0103-97332009000400010},  number={2a},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Hamadou-Ibrahim, A. and Plastino, A. R. and Plastino, A.},  year={2009},  month={Aug},  pages={408–412} }