Smedshaug, C. A., S. E. Lund, A. Brekke, G. A. Sonerud, and T. Rafoss. “The Importance of the Farmland-Forest Edge for Area Use of Breeding Hooded Crows As Revealed by Radio Telemetry”. Ornis Fennica, vol. 79, no. 1, Mar. 2002, pp. 1–13, https://ornisfennica.journal.fi/article/view/133565.