@misc{indiciae377134e55554,
  title = {A note on subtrees rooted along the primary path of a binary tree},
  author = {Brent M. Troutman and Michael R. Karlinger},
  year = {1993},
  doi = {10.1016/0166-218x(93)90181-m},
  url = {https://pubs.usgs.gov/publication/70018378},
  note = {Source identifier: 70018378}
}