Leadley, S. R., Davies, M. C., Ribeiro, C. C., Barbosa, M. A., Paul, A. J., & Watts, J. F. (1997). Investigation of the dissolution of the bioceramic hydroxyapatite in the presence of titanium ions using ToF-SIMS and XPS. BiomaterialsBIOMATERIALS, 18(4Oxford, United Kingdom), 311 - 316.

Ribeiro, C. C., Barbosa, M. A., Machado, A. A. S. C., Tudor, A., & Davies, M. C. (1995). Modifications in the molecular structure of hydroxyapatite induced by titanium ions. Journal of Materials Science: Materials in MedicineJ. MATER. SCI. MATER. MED., 6(12London, United Kingdom), 829 - 834.