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R. W. J. M. van der Ham, P. Baas, M. E. Barker, F. D. Boesewinkel, F. Bouman, B. J. van Heuven, R. K. W. M. Klaassen, Bottegoa Chiov. Transferred to the Ptaeroxylaceae, Kew Bulletin, Vol. 50, No. 2 (1995), pp. 243-265
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Ham et al. (1995) studied this question.
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