1. The Earth Tides;Melchior,1966
2. On ultra-long period seismometers operating under vacuum;Blum,1966
3. On some problems of tidal observations with tiltmeters and their accuracy;Skalasky;Studia Geoph. et Geod.,1969
4. A tiltmeter study of the response of the Earth to ocean tide loading;Lambert,1969
5. Calibration tests and comparative performance of horizontal pendulums at a single station;Lennon,1969