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Roulin, A.; Gasparini, J.; Bize, P.; Ritschard, Mathias; Richner, Heinz (2008). Melanin-based colorations signal strategies to cope with poor and rich environments. Behavioral ecology and sociobiology, 62(4), pp. 507-519. Heidelberg: Springer 10.1007/s00265-007-0475-2
