Thomas Padron-McCarthy, Tore Risch:
Optimizing Performance-Polymorphic Declarative Database Queries.
In Second International Workshop on Real-Time Databases (RTDB'97), Burlington,   Vermont, USA, September 18-19, 1997.

Ling Lin, Tore Risch:
Using a Sequential Index in Terrain-Aided Navigation.
In The Sixth International Conference on Information and Knowledge Management (  CIKM'97), ACM, Las Vegas, Nevada, USA, November 10-14, 1997.