1 A.. Lambert, J.O. Liard, N.. Courtier, A.K. Goodacre, R.K. McConnell, and J.E. Faller, Eos, Transactions American Geophysical Union 70, (1989).
1 Y.. Boulanger, J.E. Faller, E.. Groten, G.. Arnautow, and M.. Becker, Results of the International Comparison of Absolute Gravimeters (2nd) Held in Sevres, France in June-July 1985 (Defense Technical Information Center, 1987).