Template:Guo et al., 2013a
- Guo, X., Wang, R.J., Simmons, M.P., But, P.P.H. & Yu, J. 2013. Phylogeny of the Asian Hedyotis–Oldenlandia complex (Spermacoceae, Rubiaceae): Evidence for high levels of polyphyly and the parallel evolution of diplophragmous capsules. Molecular Phylogenetics and Evolution 67(1): 110-122. DOI: 10.1016/j.ympev.2013.01.006 PDF