Keskin, E., A. Erdogan, and I. Karabulut. “Efficacy of Semirigid Ureterorenoscopy With the Use of Ureteral Acsess Sheath in the Treatment of Impacted Ureteral Stones: A Prospective Randomized Study”. Annals of Medical Research, vol. 27, no. 12, May 2021, pp. 3148-52, http://annalsmedres.org/index.php/aomr/article/view/3611.