Kennedy, Jessie, Gales, Robert, Hyam, Roger, Kukla, Robert, Wieczorek, John, Hagedorn, Gregor, Döring, Markus and Vieglais, Dave (2006) Developing a core ontology for taxonomic data. In: Taxonomy Data Working Group (TDWG) 2006, 15-22 October 2006, Missouri Botanical Gardens, St. Louis, Missouri, USA.