J.  Podani, ?Taxonomy versus evolution?, Taxon, vol. 58, no. 4, pp. 1049-1053, 2009.

R. M.  Bateman and Hilton, J., ?Palaeobotanical systematic for the phylogenetic age: applying organ-species, form-species and phylogenetic species concepts in a framework of reconstructed fossil and extant whole-plants?, Taxon, vol. 58, no. 4, pp. 733-750, 2009.