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Le Vin, Ashley L.; Mable, B.K.; Taborsky, Michael; Heg, Dik; Arnold, Kathryn E. (2011). Individual variation in helping in a cooperative breeder: relatedness versus behavioural type. Animal behaviour, 82(3), pp. 467-477. Amsterdam: Elsevier Ltd. 10.1016/j.anbehav.2011.05.021