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Margalida, Antoni; Braun, Markus S.; Negro, Juan José; Schulze-Hagen, Karl; Wink, Michael (2019). Cosmetic colouring by Bearded Vultures Gypaetus barbatus: still no evidence for an antibacterial function. PeerJ, 7, e6783. PeerJ, Ltd 10.7717/peerj.6783
Schulze-Hagen, Karl; Frey, Hans; Margalida, Antoni (2016). Ernährungsspezialist Bartgeier: Der Vogel, der von Knochen lebt. Der Falke, 63(Sonderheft), pp. 8-15.
