@misc{indiciaea059babb0119,
  title = {Calcified nucleus pulposus visualizing disk rupture in plain roentgenogram.},
  author = {L Walk},
  year = {1976},
  doi = {10.1055/s-0029-1230289},
  url = {https://pubmed.ncbi.nlm.nih.gov/130327/},
  note = {Source identifier: 130327}
}