@misc{indiciae79d3eac90a38,
  title = {Role expansion or role extension: some conceptual differences.},
  author = {J F Murphy},
  year = {1970},
  doi = {10.1111/j.1744-6198.1970.tb01049.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/5205119/},
  note = {Source identifier: 5205119}
}