Rassati, G. Responsiveness to Acoustic Stimulation, Distribution and Habitat Preferences of the Grey-Headed Woodpecker, Picus Canus, and the Three-Toed Woodpecker, Picoides Tridactylus, in Friuli-Venezia Giulia (North-Eastern Italy). Riv Ital Ornitol 2015, 84, 41-52.