Boulanger Y., 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).
Boulanger Y., and J.E. Faller, Bureau Gravimetrique International, Bull. D\Textquoterightinformation No. 68, (1990).