@misc{indiciaec215f60d7038,
  title = {Progressive systemic sclerosis.},
  author = {R A Harper and D C Jackson},
  year = {1965},
  doi = {10.1259/0007-1285-38-455-825},
  url = {https://pubmed.ncbi.nlm.nih.gov/5842579/},
  note = {Source identifier: 5842579}
}