@article{rubinger_oliveira_ribeiro_soares_moreira_1999,  title={Observation of low frequency oscillations in GaAs samples grown by molecular beam epitaxy at low temperatures},  volume={29},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97331999000400039},  DOI={10.1590/S0103-97331999000400039},  number={4},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Rubinger, R. M. and Oliveira, A. G. de and Ribeiro, G. M. and Soares, D. A. W. and Moreira, M. V. B.},  year={1999},  month={Dec},  pages={797–800} }