Some presentations in pdf-format

Cross P A: Accuracies achievable by GPS in practical engineering and surveying applications

Eriksson P-E: Requirements on the height benchmarks in the third precise levelling of Sweden

Fischer T, Fischer W: Manufacturing of high precision levelling rods

Higgins M B: Heighting with GPS: Possibilities or Limitations

Ingensand H: The evolution of digital levelling techniues - limitations and new solutions

Jaeger R: State of the art and present developments of a general approach for GPS-based height determination

Lilje M, Eriksson P-E: The production line used in the third precise levelling of Sweden

Poutanen M: Use of GPS in unification of vertical datums and detection of levelling network errors

Schwarz K-P: Some trends in Geomatics - Multi-sensor systems and global georeferencing