1. Agnew, D.C., and Farrell, W.E., 1978, Geophys. J. R. astr. Soc., 55, 171
2. Brosche, P., 1981, Mitt. Astron. Gesellschaft, 51, 81
3. Brosche,P., and Hövel, W., 1981, BII
4. Brosche, P., and Sündermann, J., 1977, in: Scientific Applications of Lunar Laser Ranging (ed. J.D. Mulholland), Reidel, Dordrecht Boston, p. 133
5. Calame, O., and Mulholland, J.D., 1978, BI, p. 43