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Jankowiak, L., Antczak, M., Kwieciñski, Z., Szymañski, P., Tobolka, M. ja Tryjanowski, P. 2015. Diurnal raptor community wintering in an extensively used farmland. Ornis Fennica. 92, 2 (heinä 2015), 76–86. DOI:https://doi.org/10.51812/of.133870.