@misc{indiciaec59d661edc93,
  title = {Why no contracts?},
  author = {J A Rupke},
  year = {1977},
  doi = {10.1016/s0361-1124(77)80392-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/916483/},
  note = {Source identifier: 916483}
}