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Werner Greuter, John McNeill, Dan H. Nicolson, Report on Botanical Nomenclature: Berlin 1987. XIV International Botanical Congress, Berlin: Nomenclature Section, 20 to 24 Juli 1987, Englera, No. 9, Report on Botanical Nomenclature: Berlin 1987. XIV International Botanical Congress, Berlin: Nomenclature Section, 20 to 24 Juli 1987 (1989), pp. 3+5-228
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Greuter et al. (1989) studied this question.
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