@misc{indiciae7c6a065b13ca,
  title = {Biological activity of titanium dioxides.},
  author = {A Zitting and E Skyttä},
  year = {1979},
  doi = {10.1007/bf00378147},
  url = {https://pubmed.ncbi.nlm.nih.gov/220195/},
  note = {Source identifier: 220195}
}