International Astronomical Union.Relativity in colestial mechanics and astrometry (114th : 1985 : Leningrad)):high Precisic dynamical theories and observational vorifications : proceedings of the 114th Symposium, Loningrad, 1985.IAU,1986.
Relativity in colestial mechanics and astrometry (114th : 1985 : Leningrad)):high Precisic dynamical theories and observational vorifications : proceedings of the 114th Symposium, Loningrad, 1985