@misc{indiciaee5200735a836,
  title = {Retrograde percutaneous stone removal using modified Lawson technique.},
  author = {J P Spirnak and M I Resnick},
  year = {1987},
  doi = {10.1016/0090-4295(87)90434-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/3686771/},
  note = {Source identifier: 3686771}
}