@misc{indiciae6ff15220ccb3,
  title = {Where have they gone?},
  author = {T C Kalkhof},
  year = {1976},
  doi = {10.1016/s0033-3182(76)71164-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/1273246/},
  note = {Source identifier: 1273246}
}