P. G. Holland, D. G. Steyn, R. F. Fuggle, Habitat Occupation by Aloe ferox Mill. (Liliaceae) in Relation to Topographic Variations in Direct Beam Solar Radiation Income, Journal of Biogeography, Vol. 4, No. 1 (Mar., 1977), pp. 61-72
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Holland et al. (1977) studied this question.
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