@misc{indiciae63940be6dd35,
  title = {Register problems.},
  author = {J Van den Berg},
  year = {1968},
  doi = {10.1111/j.1749-6632.1968.tb56756.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/5258044/},
  note = {Source identifier: 5258044}
}