Trevor Paterson Jessie B. Kennedy Martin R. Pullan Alan Cannon Kate Armstrong Mark F. Watson Cedric Raguenaud Sarah M. McDonald Gordon Russell A Universal Character Model and Ontology of Defined Terms for Taxonomic Description. 63-78 http://dx.doi.org/10.1007/978-3-540-24745-6_5 2004 conf/dils/2004 DILS db/conf/dils/dils2004.html#PatersonKPCAWRMR04