@misc{indiciae0c4d64bd4160,
  title = {Variations in mechanical sampling: their causes and effects.},
  author = {A S McLelland and A Fleck and D Wagstaff and R Robinson},
  year = {1975},
  doi = {10.1177/000456327501200135},
  url = {https://pubmed.ncbi.nlm.nih.gov/15637910/},
  note = {Source identifier: 15637910}
}