@inbook{125217, author={David T. Schwartz}, title={Chapter V-6. Hyperflexion Sprain—Flexion/Extension Views}, booktitle={Emergency Radiology: Case Studies}, publisher={The McGraw-Hill Companies}, address={New York, NY}, year={2008}, url={accessemergencymedicine.mhmedical.com/content.aspx?aid=125217} }