Brambilla, M., D. Rubolini, and F. Guidali. “Eagle Owl Bubo Bubo Proximity Can Lower Productivity of Cliff-Nesting Peregrines Falco Peregrinus”. Ornis Fennica, vol. 83, no. 1, Mar. 2006, pp. 20–26, https://ornisfennica.journal.fi/article/view/133650.