@conference{173,
  author = {Monika Lanzenberger and Silvia Miksch},
  title = {The Hyperbolic Hypotheses Tree},
  year = {2003},
  journal = {Proceedings of the World Conference on Educational Multimedia, Hypermedia & Telecommunications (ED-Media 03)},
  pages = {831–834},
  publisher = {AACE},
  isbn = {1-880094-45-2},
  url = {http://www.ifs.tuwien.ac.at/ mlanzenberger/publications/HHT.pdf},
  language = {eng},
}