Slotow, R.; Dyk, G. van 2001. Role of delinquent young ‘orphan’ male elephants in high mortality of white rhinoceros in Pilanesberg National Park, South Africa. Koedoe 44 (1): 84-94, figs. 1-3, tables 1-2.
Slotow, R.; Dyk, G. van; Poole, J.; Page, B.; Klocke, A. 2000. Older bull elephants control young males. Nature 408, 23 November 2000: 425-426, fig. 1, table 1.






