@article{gonzález_porras-montenegro_duque_2006,  title={Hydrostatic pressure and electric-field effects on the shallow donor impurity states in GaAs-Ga0.7Al0.3As quantum-well wires},  volume={36},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332006000600039},  DOI={10.1590/S0103-97332006000600039},  number={3b},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={González, J. W. and Porras-Montenegro, N. and Duque, C. A.},  year={2006},  month={Sep},  pages={944–947} }