@misc{indiciaec144ccdeff9b,
  title = {Subgroups A1 and A2: qualitative and/or quantitative distinctions?},
  author = {J F Mohn and R K Cunningham},
  year = {1980},
  doi = {10.3109/08820138009065986},
  url = {https://pubmed.ncbi.nlm.nih.gov/6156891/},
  note = {Source identifier: 6156891}
}