@misc{indiciaed8d8dd97c99c,
  title = {Root surface measurement using a digital computer.},
  author = {J I Nicholls and C H Daly and W L Kydd},
  doi = {10.1177/00220345740530060701},
  url = {https://pubmed.ncbi.nlm.nih.gov/4529921/},
  note = {Source identifier: 4529921}
}