Busoni E. & Colica A., 2003, Analysis of linears, landforms and geology relationships and anthropuc effects in the period 1976-1994, northern Asso river basin (Siena, Italy), 26 (2003): 15–27.,
URL: http://www.cnr.it/prodotto/i/66843

Data from https://intranet.cnr.it/people/