@misc{indiciaebffd5ab02eb2,
  title = {Transistor-amplifier units for absorptiometry.},
  author = {P W PERRYMAN and D H RICHARDS},
  year = {1956},
  doi = {10.1136/jcp.9.3.273},
  url = {https://pubmed.ncbi.nlm.nih.gov/13357631/},
  note = {Source identifier: 13357631}
}