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van Noordwijk, M A; Arora, N; Willems, E P; Dunkel, L P; Amda, R N; Mardianah, N; Ackermann, C; Krützen, M; van Schaik, C P (2012). Female philopatry and its social benefits among Bornean orangutans. Behavioral Ecology and Sociobiology, 66(6):823-834.