, Quentin C. B. Cronk, Phylogenetic Studies in Streptocarpus (Gesneriaceae): Reconstruction of Biogeographic History and Distribution Patterns, Systematics and Geography of Plants, Vol. 71, No. 2, Plant Systematics and Phytogeography for the Understanding of African Biodiversity (2001), pp. 545-555
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Möller et al. (2001) studied this question.
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