@misc{indiciae6a8ecbe5cb4b,
  title = {Nonopaque ureteral calculus.},
  author = {J E ALLEN},
  year = {1961},
  doi = {10.1016/0002-9610(61)90766-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/13682531/},
  note = {Source identifier: 13682531}
}