Grimaldi S., Nardi S, Di Benedetto F., Istanbulluoglu E., Bras R.L., 2007, A physically-based method for removing pits in digital elevation models., Advances in water resources 30(10 (2007): 2151–2158.,
URL: http://www.cnr.it/prodotto/i/41572

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