[1]
Osiejuk, T., Ratyńska, K., Dale, S., Steifetten, Øyvind and Cygan, J. 2004. Ortolan Buntings Emberiza hortulana mimicking other species and other dialects of own species. Ornis Norvegica. 27, (Jan. 2004), 73-79. DOI:https://doi.org/10.15845/on.v27i0.199.