Dynamics and astrometry of natural and artificial celestial bodies : proceedings of IAU colloquium 165, Poznań, Poland, July 1-5, 1996
Dynamics and astrometry of natural and artificial celestial bodies : proceedings of IAU colloquium 165, Poznań, Poland, July 1-5, 1996 / ed. by I.M. Wytrzyszczak, J.H. Lieske, R.A. Feldman