Boulalas, I., M. De Dominicis, and L. Defidio. “Semirigid Ureteroscopy Prior Retrograde Intrarenal Surgery (RIRS) Helps to Select the Right Ureteral Access Sheath”. Archivio Italiano Di Urologia E Andrologia, Vol. 90, no. 1, Mar. 2018, pp. 20-24, doi:10.4081/aiua.2018.1.20.