@misc{indiciaecd1a04858751,
  title = {[Portable spirometer ECh-1].},
  author = {E V Cherkas and B M Egidis and I M Chernyĭ},
  year = {1965},
  url = {https://pubmed.ncbi.nlm.nih.gov/5870696/},
  note = {Source identifier: 5870696}
}