Joshi, A., and S. Srivastava. “An Observational Study of Incidence of Urological Intervention in Patients of Renal Colic With Normal and Abnormal Ultrasound Study”. International Surgery Journal, vol. 5, no. 3, Feb. 2018, pp. 810-4, doi:10.18203/2349-2902.isj20180445.