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Drews, Barbara; Harmann, Leanne M.; Beehler, Leann L.; Bell, Barbara; Drews, Reinhard F.; Hildebrandt, Thomas B. (2011). Ultrasonographic monitoring of fetal development in unrestrained bonobos (Pan paniscus) at the Milwaukee County Zoo. Zoo biology, 30(3), pp. 241-253. Wiley 10.1002/zoo.20304
