@misc{indiciaea9cdf95095b9,
  title = {Spirit level.},
  author = {B Stokes},
  year = {1997},
  doi = {10.7748/ns.12.3.14.s32},
  url = {https://pubmed.ncbi.nlm.nih.gov/9370661/},
  note = {Source identifier: 9370661}
}