Tufano, A., M. Frisenda, A. Rossi, P. Viscuso, G. Mantica, P. Bove, R. Leonardi, and A. Calarco. “External Validation of Resorlu-Unsal Stone Score in Predicting Outcomes After Retrograde Intrarenal Surgery. Experience from a Single Institution”. Archivio Italiano Di Urologia E Andrologia, vol. 94, no. 3, Sept. 2022, pp. 311-4, doi:10.4081/aiua.2022.3.311.