Hypersensitivity to copper verified by test with 0.1% CuSO4.

@article{Frstrm1977HypersensitivityTC,
  title={Hypersensitivity to copper verified by test with 0.1% CuSO4.},
  author={L R F{\"o}rstr{\"o}m and Raija Kiistala and K Tarvainen},
  journal={Contact dermatitis},
  year={1977},
  volume={3 5},
  pages={280-1}
}