@article{silva_silva_villela filho_2002,  title={Hydrous Tantalum Phosphates for Ion Exchange Purposes: A Systematic Study},  volume={5},  ISSN={1516-1439},  url={https://doi.org/10.1590/S1516-14392002000100012},  DOI={10.1590/S1516-14392002000100012},  number={1},  journal={Materials Research},  publisher={ABM, ABC, ABPol},  author={Silva, M.L.C.P.da and Silva, G.L.J.P. da and Villela Filho, D.N.},  year={2002},  month={Jan},  pages={71–75} }