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Podlas, Katarzyna; Helfenstein, Fabrice Noël; Richner, Heinz; Sorci, Gabriele (2013). Brood Reduction via Intra-clutch Variation in Testosterone - An Experimental Test in the Great Tit. PLoS ONE, 8(2), e56672. Public Library of Science 10.1371/journal.pone.0056672