@misc{indiciaeca08c5fd1979,
  title = {Primary retroperitoneal tumors.},
  author = {S Oriana and P Bonardi and F Preda},
  doi = {10.1177/030089167706300412},
  url = {https://pubmed.ncbi.nlm.nih.gov/929704/},
  note = {Source identifier: 929704}
}