@article{pinheiro_krambroc_1999,  title={Experimental evidence for the distinction between metastability and persistence in optical and electronic properties of bulk GaAs and AlGaAs},  volume={29},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97331999000400041},  DOI={10.1590/S0103-97331999000400041},  number={4},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Pinheiro, M.V.B and Krambroc, K.},  year={1999},  month={Dec},  pages={806–809} }