Ray, A. A. et al. Limitations to Ultrasound in the Detection and Measurement of Urinary Tract Calculi. Urology 2010. doi:10.1016/j.urology.2009.12.015

Noble, V. E. and Brown, D. F. M. Renal ultrasound. Emerg Med Clin N Am 22 (2004) 641–659. doi:10.1016/j.emc.2004.04.014

Smith-Bindman, R. et al. Ultrasonography versus Computed Tomography for Suspected Nephrolithiasis. N Engl J Med 2014;371:1100-10.DOI: 10.1056/NEJMoa1404446

Smith, R. J. and Horrow, M. M. Ultrasonographic Evaluation of Acute Urinary Tract and Male Genitourinary Pathology. Ultrasound Clin 6 (2011) 195–213 doi:10.1016/j.cult.2011.03.007