@misc{indiciae21ac265ebf5b,
  title = {Particle analyzing method and apparatus},
  author = {Sinha, M. P. and Griffin, C. E. and Norris, D. D. and Friedlander, S. K.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19830018913},
  note = {Source identifier: 19830018913}
}