@misc{indiciaed192eca30f76,
  title = {Problems with PPOs.},
  author = {L H Steinholtz},
  year = {1984},
  doi = {10.1016/0278-2391(84)90106-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/6585501/},
  note = {Source identifier: 6585501}
}