M.  Englund, Pornpongrungrueng, P., Gustafsson, M. H. G., and Anderberg, A. A., ?Phylogenetic relationships and generic delimitation in Inuleae subtribe Inulinae (Asteraceae) based on ITS and cpDNA sequence data?, Cladistics, vol. 25, no. 4, pp. 319 - 352, 2009.

A. A.  Anderberg, ?Taxonomy and phylogeny of the tribe Gnaphalieae?, (Asteraceae) Opera Botanica, vol. 104, pp. 1 - 195, 1991.