@misc{indiciaeeaed7bb243b4,
  title = {Filter efficiency.},
  author = {J S Paterson and R G Dorman and H M Darlow and R Cook and J B Brooksby and R F Sellers and W Bruce},
  year = {1970},
  url = {https://pubmed.ncbi.nlm.nih.gov/4321102/},
  note = {Source identifier: 4321102}
}