Pedrosa, A., M. C. Lanca, J. P. Borges, E. R. Neagu, C. J. Dias, J. N. Marat-Mendes, and Ieee. "Influence of Polarization on the Bioactivity of Nanopowders of Hydroxyapatite." 2011 14th International Symposium on Electrets. International Symposium on Electrets. 2011. 55-56.