Chiocchini, Ugo, and Celestino Grassi. “The Roman Hydraulic System of Frigento (Campania, Southern Italy)”. Italian journal of engineering geology and environment, no. 1 (June 30, 2015): 61–73. Accessed November 22, 2024. https://rosa.uniroma1.it/rosa02/engineering_geology_environment/article/view/803.