@misc{indiciae081872b3bd42,
  title = {Naturally occurring fibromas of grey squirrels related to Shope's rabbit fibroma},
  author = {L. Kilham and C. M. Herman and E.R. Fisher},
  year = {1953},
  url = {https://pubs.usgs.gov/publication/5220543},
  note = {Source identifier: 5220543}
}