Torsten Eriksson, Michael J. Donoghue, Phylogenetic Relationships of Sambucus and Adoxa (Adoxoideae, Adoxaceae) Based on Nuclear Ribosomal ITS Sequences and Preliminary Morphological Data, Systematic Botany, Vol. 22, No. 3 (Jul. - Sep., 1997), pp. 555-573
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Eriksson et al. (1997) studied this question.
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