B. Massa, E. D. Canale, G. Lo Verde, G. Congi, T. La Mantia, and R. Ientile, “Mediterranean Crossbills <em>Loxia curvirostra</em> sensu lato (Aves, Passeriformes): new data and directions for future research”, Riv Ital Ornitol, vol. 92, no. 1, pp. 41–60, May 2022.