Building and applying a concept hierarchy representation of a user profile Nikolaos Nanas, Victoria S. Uren, and Anne N. De Roeck   View Paper (PDF)   Return to Human interaction BIBTEX @inproceedings       {DBLP:conf/sigir/NanasUR03,   author    = {Nikolaos Nanas and                 Victoria S. Uren and                 Anne N. De Roeck},    booktitle = {SIGIR},    title     = {Building and applying a concept hierarchy representation of a user profile.},    pages     = {198-204},    year      = {2003},    url       = {db/conf/sigir/sigir2003.html#NanasUR03},    ee        = {http://doi.acm.org/10.1145/860473},    crossref  = {conf/sigir/2003},    bibsource = {DBLP, http://dblp.uni-trier.de}  } ©2004 Association for Computing Machinery