@article{russo_scalvi_scalvi_vismara_2012,  title={Photo-induced dipole relaxation current in natural Amethyst},  volume={15},  ISSN={1516-1439},  url={https://doi.org/10.1590/S1516-14392012005000052},  DOI={10.1590/S1516-14392012005000052},  number={3},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={Russo, Fabricio Trombini and Scalvi, Rosa Maria Fernandes and Scalvi, Luis Vicente de Andrade and Vismara, Marcus Vinicius Gonçalves},  year={2012},  month={May},  pages={461–466} }