@misc{indiciaec64b9cc4d600,
  title = {Retroperitoneal extraskeletal osteosarcoma.},
  author = {C S van Rijswijk and J G Lieng and H M Kroon and P C Hogendoorn},
  year = {2001},
  doi = {10.1136/jcp.54.1.77},
  url = {https://pubmed.ncbi.nlm.nih.gov/11271796/},
  note = {Source identifier: 11271796}
}