Jacobsen, L. B., P. Sunde, C. Rahbek, T. Dablesteen, and K. Thorup. “Territorial Calls in the Little Owl (Athene noctua): Spatial Dispersion and Social Interplay of Mates and Neighbours”. Ornis Fennica, vol. 90, no. 1, Mar. 2013, pp. 41–49, doi:10.51812/of.133820.