@misc{indiciae134554c66470,
  title = {Vocal output in preterm infants.},
  author = {L Beckwith and M Sigman and S E Cohen and A H Parmelee},
  year = {1977},
  doi = {10.1002/dev.420100608},
  url = {https://pubmed.ncbi.nlm.nih.gov/563823/},
  note = {Source identifier: 563823}
}