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L. Catarino, E. S. Martins, I. Moreira, Influence of Environmental Features in the Phytogeographic Framework of Guinea-Bissau, Systematics and Geography of Plants, Vol. 71, No. 2, Plant Systematics and Phytogeography for the Understanding of African Biodiversity (2001), pp. 1079-1086
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Catarino et al. (2001) studied this question.
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