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| Author | Title | Year | Publication | Serial | Volume  |
Pages |
|---|---|---|---|---|---|---|
| Dunbar, R.I.; Dunbar, E.P. | Contrasts in social structure among black-and-white colobus monkey groups | 1976 | Animal Behaviour. | 2049 | 24 | 84-92 |
| de Waal, F.B.M.; Luttrell, L.M. | Mechanisms of social reciprocity in three primate species: Symmetrical relationship characteristics or cognition? | 1988 | Ethology and Sociobiology | 5809 | 9 | 101-118 |