@misc{indiciaeac3ec9a5033a,
  title = {Intervertebral disc calcification with complete protrusion intraspongially.},
  author = {W Edgren and E O Karaharju and O Snellman},
  year = {1973},
  doi = {10.3109/17453677308989105},
  url = {https://pubmed.ncbi.nlm.nih.gov/4770134/},
  note = {Source identifier: 4770134}
}