@misc{indiciae27920101697d,
  title = {A third dissociation constant for tryptophan.},
  author = {R C Armstrong},
  year = {1968},
  doi = {10.1016/0304-4165(68)90091-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/5652431/},
  note = {Source identifier: 5652431}
}