1. A hypertext system with controlled hype;Benest,1990
2. As we may think;Bush,1945
3. The INQUERY retrieval system;Callan,1992
4. Bead: Explorations in information visualization;Chalmers,1992
5. The effect of markup-querying on search pattern and performance in large-scale text retrieval;Charoenkitkarn,1996