@misc{indiciaeb99e4b2d831b,
  title = {Letter: Tryptophan in depression.},
  author = {S Montgomery and A Coppen},
  year = {1974},
  doi = {10.1016/s0140-6736(74)91170-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/4138420/},
  note = {Source identifier: 4138420}
}