@misc{indiciaece30a9a8715d,
  title = {Double thumb.},
  author = {W J Boerema and B M Underhill},
  year = {1967},
  doi = {10.5694/j.1326-5377.1968.tb27551.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/6066529/},
  note = {Source identifier: 6066529}
}