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).
Robertsson L., O. Francis, T.M. vanDam, J.E. Faller, D. Ruess, J.-M. Delinte, L. Vitushkin, J.O. Liard, C. Gagnon, G.Y. Guang, and H. Da Lun, Metrologia38, 71-78(2001).