@article{macedo_martinez_hernandes_2003,  title={Characterization of Bi4Ge3O12 single crystal by impedance spectroscopy},  volume={6},  ISSN={1516-1439},  url={https://doi.org/10.1590/S1516-14392003000400026},  DOI={10.1590/S1516-14392003000400026},  number={4},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={Macedo, Zélia Soares and Martinez, André Luiz and Hernandes, Antonio Carlos},  year={2003},  month={Oct},  pages={577–581} }