@misc{indiciaeb95355e19fc7,
  title = {A study of HEPA filter efficiency in submicron particle range},
  author = {Klamerus, L. J. and Tillery, M. I.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19680019871},
  note = {Source identifier: 19680019871}
}