Template:Martins & Hellwig, 2005
- Martins, L. & Hellwig, F.H. 2005. Systematic position of the genera Serratula and Klasea within Centaureinae (Cardueae, Asteraceae) inferred from ETS and ITS sequence data and new combinations in Klasea. Taxon 54(3): 632–638. DOI: 10.2307/25065420 JSTOR