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Authors whose works are in public domain in at least one jurisdiction

List of works by Frank H. Hellwig

Phylogeny of the tribe Cardueae (Compositae) with emphasis on the subtribe Carduinae: an analysis based on ITS sequence data

scientific article published on 10 December 1999

The genus Psephellus Cass. (Compositae, Cardueae) revisited with a broadened concept

scientific article published in 2000

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