@misc{indiciae7e32a514cef0,
  title = {Letter: Problems lists.},
  author = {W J Mulligan},
  year = {1973},
  doi = {10.7326/0003-4819-79-5-763\_1},
  url = {https://pubmed.ncbi.nlm.nih.gov/4751768/},
  note = {Source identifier: 4751768}
}