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Huchard, E and Benavides, J and Setchell, J M and Charpentier, M J and Alvergne, A and King, A J and Knapp, L G and Cowlishaw, G and Raymond, M (2009) Studying shape in sexual signals: the case of primate sexual swellings. Behavioural Ecology & Sociobiology, 63 (8). pp. 1231-1242.