Ghebremeskel, K.; Williams, G.; Brett, R.; Burek, R.; Harbige, L.S. 1991. Nutrient composition of plants most favoured by black rhinoceros (Diceros bicornis) in the wild. Comparative Biochemistry and Physiology 98A (3/4): 529-534.
Ghebremeskel, K.; Williams, G.; Lewis, J.C.M.; Du Toit, R. 1988. Serum alpha-tocopherol, all-trans retinol, total lipids and cholesterol in the black rhinoceros (Diceros bicornis). Comparative Biochemistry and Physiology 91A: 343-345, table 1.
Ghebremeskel, K.; Williams, G. 1988. Plasma retinol and alpha-tocopherol levels in captive wild animals. Comparative Biochemistry and Physiology 89B: 279-283, figs. 1-2, table 1.






