Template:Castro et al., 2007
- Castro, S., Silveira, P., Coutinho, A.P. & Paiva, J. 2008 ["2007"]. Heterosamara sect. Villososperma comb. nov. (Polygalaceae) from eastern Asia. Nordic Journal of Botany 25: 286–293. DOI: 10.1111/j.0107-055X.2007.00155.x PDF