@misc{indiciae57341f3a0028,
  title = {Letter: Tryptophan in depression.},
  author = {M Peet},
  year = {1974},
  doi = {10.1016/s0140-6736(74)92104-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/4138421/},
  note = {Source identifier: 4138421}
}