@misc{indiciaeaefb149baf58,
  title = {Engel unopposed?},
  year = {1972},
  doi = {10.7326/0003-4819-77-2-318\_2},
  url = {https://pubmed.ncbi.nlm.nih.gov/4641663/},
  note = {Source identifier: 4641663}
}