@misc{indiciaeac0c693a8c90,
  title = {Invisible retainers.},
  author = {R J Ponitz},
  year = {1971},
  doi = {10.1016/0002-9416(71)90099-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/5276727/},
  note = {Source identifier: 5276727}
}