1. ROSETTA/CNSR System Definition Study, Final Report MATRA ESPACE, January 1991, ESA Contract 8228/89 /NL/SK
2. Advanced GNC Concepts and Techniques for an Interplanetary Mission;Champetier;14 th Annual AAS Guidance and Control Conference,1991
3. Autonomous and Advanced GNC Techniques for the Interplanetary ROSETTA Mission;Champetier;First International Conference on Spacecraft Guidance. Navigation and Control Systems,1991
4. Autonomous and Advanced Navigation Techniques Study, Phase 1 Summary Report MATRA MARCONI SPACE, August 1992, ESA Contract 8808/90/NL/PM
5. Study and Design of a Comet Approach and Landing System. October 1991. Executive Summary Officine Galileo, ESA Contract 7988/88/NL/PB(SC)