Stopwatch Observations of Satellites, December 1972
The Achievements of ESA Scientific Satellites
Stopwatch Observations of Satellites, February 1974
Stopwatch Observations of Satellites Made During the Month of March 1973
Stopwatch Observations of Satellites, November 1972
Td-1A: Evaluation of Attitude Control System from Telemetry Datas. Volume 2: Tm Data Plots
Stopwatch Observations of Satellites, October 1972
Orbit Prediction for the Astronomical Netherlands Satellite
Stopwatch Observations of Satellites, October 1973
Stopwatch Observations of Satellites, September 1972
Report Presented to the Twenty-First COSPAR Meeting
Report Presented to the Nineteenth COSPAR Meeting
Stopwatch Observations of Satellites, February 1975
Stopwatch Observations of Satellites, March 1972
Stopwatch Observations of Satellites. November 1973
Stopwatch Observations of Satellites, October 1974
On Earth Resources Satellite Projects . Ueberlegungen Zu Erdwissenschaftlichen Satellitenprojekten
Report Presented to the Thirteenth Cospar Meeting