@article{cavalheiro_zaghete_santos_varela_longo_1999,  title={Influence of synthesis and processing parameters of the columbite precursor on the amount of Perovskite PMN},  volume={2},  ISSN={1516-1439},  url={https://doi.org/10.1590/S1516-14391999000400004},  DOI={10.1590/S1516-14391999000400004},  number={4},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={Cavalheiro, A.A. and Zaghete, M.A. and Santos, C.O. Paiva and Varela, J.A. and Longo, E.},  year={1999},  month={Oct},  pages={255–260} }