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Kölliker, Mathias; Heeb, Philipp; Werner, Isabelle; Mateman, A. C.; Lessells, C. M.; Richner, Heinz (1999). Offspring sex ratio is related to male body size in the great tit (Parus major). Behavioral Ecology, 10(1), pp. 68-72. Oxford University Press 10.1093/beheco/10.1.68
