Freek T. Bakker, Alastair Culham, Priyani Hettiarachi, Tasoula Touloumenidou, Mary Gibby, Phylogeny of Pelargonium (Geraniaceae) Based on DNA Sequences from Three Genomes, Taxon, Vol. 53, No. 1 (Feb., 2004), pp. 17-28
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