@misc{indiciaeda661cf5a4be,
  title = {Limitations on analysis of small particles with an electron probe: Pollution studies},
  author = {Robert H. Heidel and G. A. Desborough},
  year = {1975},
  doi = {10.1016/0013-9327(75)90102-0},
  url = {https://pubs.usgs.gov/publication/70010077},
  note = {Source identifier: 70010077}
}