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Helfenstein, Fabrice; Berthouly, Anne; Tanner, Marion; Karadas, Filiz; Richner, Heinz (2007). Nestling begging intensity and parental effort in relation to prelaying carotenoid availability. Behavioral Ecology, 19(1), pp. 108-115. New York, N.Y.: Oxford University Press 10.1093/beheco/arm103
