Kaija M. Virolainen, Kati Nättinen, Jukka Suhonen, and Markku Kuitunen. 2001. Selecting herb-rich forest networks to protect different measures of biodiversity. Ecological Applications 11:411-420.
Appendix A: Phylogenetic classification of vascular plants in boreal herb-rich forests.
Ecological Archives A011-008-A1.