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3. C. Hirt, The Digital Zenith Camera TZK2-D-A Modern High Precision Geodetic Instrument for Automatic Geographic Positioning in Real-Time (Astronomical Data Analysis Software and Systems XII, Astronomical Society of the Pacific Conference Series. 295, San Francisco, 2003).
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5. F. A. Vening Meinesz, “A Formula Expressing the Vertical Deflection in the Gravity Anomalies and Some Formulae for the Gravity Field and the Gravity Potential Outside the Geoid,”Verhandel-Koninkl. h’ed. Akad. Wetenschap, (1928, vol. 51(3), pp. 315–331).