@misc{indiciae1b9f7ac450e1,
  title = {Multiple barrier system.},
  author = {R L Engelmeier and O C Tebrock and T G Mayfield and H J Adams},
  year = {1988},
  url = {https://pubmed.ncbi.nlm.nih.gov/2482865/},
  note = {Source identifier: 2482865}
}