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Werner Greuter, John McNeill, David L. Hawksworth, Fred R. Barrie, Report on Botanical Nomenclature: Saint Louis 1999. XVI International Botanical Congress, Saint Louis: Nomenclature Section, 26 to 30 July 1999, Englera, No. 20, Report on Botanical Nomenclature: Saint Louis 1999. XVI International Botanical Congress, Saint Louis: Nomenclature Section, 26 to 30 July 1999 (2000), pp. 3-253
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Greuter et al. (2000) studied this question.
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