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♦ ¹Orłowski, G., & Czarnecka, J. (2013). Re-evaluation of the role of the grey partridge Perdix perdix as a disperser of arable weed seeds. Journal of ornithology, 154(1), 139-144.
♦ ²The diet of the Citril Finch (Serinus citrinella) in the Pyrenees and the role of Pinus seeds as a key resource, A. Borras, T. Cabrera, J. Cabrera and J.C. Senar, J. Ornithol. 144, 345-353 (2003)