@misc{indiciae9aa8deb4766a,
  title = {Interaction between discrete causes.},
  author = {J S Koopman},
  year = {1981},
  doi = {10.1093/oxfordjournals.aje.a113153},
  url = {https://pubmed.ncbi.nlm.nih.gov/7234861/},
  note = {Source identifier: 7234861}
}