Katerina Doka Athanasia Asiki Dimitrios Tsoumakos Nectarios Koziris Online Querying of Concept Hierarchies in P2P Systems. 212-230 2008 OTM Conferences (1) http://dx.doi.org/10.1007/978-3-540-88871-0_16 conf/otm/2008-1 db/conf/otm/otm2008-1.html#DokaATK08