@misc{indiciaea552d19905c7,
  title = {Charge-transfer complexes in biological systems.},
  author = {S Shifrin},
  year = {1969},
  doi = {10.1111/j.1749-6632.1969.tb56220.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4308070/},
  note = {Source identifier: 4308070}
}