What is the role of plain radiography in patients with foreign bodies in the gastrointestinal tract?. Lee JH, Kim HC, Yang DM, Kim SW, Jin W, Park SJ, Kim HJ. Clin Imaging. 2012 Sep-Oct;36(5):447-54. doi: 10.1016/j.clinimag.2011.11.017. Epub 2012 Jun 08. PMID: 22920344
[Orthoradiography. Radiological method of the dimensional evaluation of objects and its diagnostic applications]. PICCHIO C. Radiol Med. 1961 Feb;47:152-67. PMID: 13735412
Non-metallic foreign bodies. Gordon D. Br J Radiol. 1985 Jun;58(690):574. doi: 10.1259/0007-1285-58-690-574-a. PMID: 4063724
