On labeling schemes for the semantic web. - Vassilis Christophides; Dimitris Plexousakis; Michel Scholl; Sotirios Tourtounis (WWW, 2003)

Optimizing taxonomic semantic web queries using labeling schemes. - Vassilis Christophides; Gregory Karvounarakis; Dimitris Plexousakis; Michel Scholl; Sotirios Tourtounis (J. Web Semant., 2004)