Martin Doerr Traugott Koch Douglas Tudhope Repke de Vries Special NKOS Workshop on Networked Knowledge Organization Systems. 502-505 2000 conf/ercimdl/2000 ECDL http://dx.doi.org/10.1007/3-540-45268-0_72 db/conf/ercimdl/ecdl2000.html#DoerrKTV00