Investigating the universe / papers presented to Zdeněk Kopal on the occasion of his retirement, September 1981 - Boston: D. Reidel Publishing Company, 1981 - x, 458p. - Astrophysics and space science library . ISBN: 90-277-1325-1 Subjects--Topical Terms: Astrodynamics Subjects--Index Terms: Astrodynamique Universal Decimal Class. No.: 523.03(04) / M1