@misc{indiciae80700b2017c9,
  title = {The predicted normal maximal midexpiratory flow.},
  author = {A S Kuperman and J B Riker},
  year = {1973},
  doi = {10.1164/arrd.1973.107.2.231},
  url = {https://pubmed.ncbi.nlm.nih.gov/4683581/},
  note = {Source identifier: 4683581}
}