@inproceedings{DBLP:conf/ds/BollK99,
  author    = {Susanne Boll and
               Wolfgang Klas},
  title     = {ZYX - A Semantic Model for Multimedia Documents and Presentations},
  booktitle = {DS-8},
  year      = {1999},
  pages     = {189-209},
  crossref  = {DBLP:conf/ds/1999},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/ds/1999,
  editor    = {Robert Meersman and
               Zahir Tari and
               Scott M. Stevens},
  title     = {Database Semantics - Semantic Issues in Multimedia Systems,
               IFIP TC2/WG2.6 Eighth Working Conference on Database Semantics
               (DS-8), Rotorua, New Zealand, January 4-8, 1999},
  booktitle = {DS-8},
  publisher = {Kluwer},
  series    = {IFIP Conference Proceedings},
  volume    = {138},
  year      = {1998},
  isbn      = {0-7923-8405-9},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}