@misc{indiciae13ae6b3d39cc,
  title = {Common ground.},
  author = {R A Nelson},
  year = {1973},
  doi = {10.1016/s0140-6736(73)93077-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/4124056/},
  note = {Source identifier: 4124056}
}